The March 2013 regulatory change was announced in December 2009 (
https://www.document-center.com/standards/show/IEC-60950-1/A1) - so Apple had more than three years to make the minor changes necessary. (And standards are usually available in draft form for a year or more before publication.)
yeah that was plenty of time if they were actually working on it.
I suspect that the real reason is that Apple expected to have the MP6,1 ready by then, but the MP6,1 was delayed for a long time.
More likely they really weren't working on it much alt all in 2010-2011. Several aspects of the MP6,1 (MP 2013) were oriented around Thunderbolt 2. TB v2 was on track to ship in volume in 2014 so it is extremely unlikely that they were trying to create a MP6,1 in 2012. The TBv2 tech wasn't going to come until
1-2 years later. ( perhaps there was some rosey eyed Intel roadmap that had a shorter time frame that Apple hitched their wagon too. )
The high dependency on TBv2 was one of contributing factors of why it slid all the way to the end of 2013 for launch. Intel hadn't even ramped on TBv2 controllers and just filling the October MacBook Pros was probably most of the available supply.
The other issue about the 2012 model is that Apple did
zero updates to the video cards. The exact same video cards shipped in 2010 were still the only configuration options in 2012 and all the way through end of 2013. Two 3rd party cards showed up in later in 2012, but if I recall correctly Apple never added them to the BTO options. ( They were in the Apple Store online, but Apple never committed to volume buying those).
If there was some mysterious 2012 model that was late at the very least Apple could have pulled the video card from that and turned it into something for the 2012. 2012 was primarily a stop gap. Largely a demo that they had not completely abandoned the Mac Pro space but pragmatically probably had and simply changed their minds. Apple put the tag "new" on the 2012 and some folks filed a FTC complaint and made Apple take it off the that 2012 model. ( because in a large extent is wasn't 'new'. tweaked firmware and some 'less old' stuff placed in the CPU sockets in most of the models. That was about it.).
2012 is much like the stop gap Apple has done with the 2010-2012 Mojave kludge they have put together. They had nothing suitable just keep the planes circling the airport and hope they wait.
I think the lack of any GPU upgrade at that point was more indicative there wan't anything substantive in flight in 2011 at all. I think they simply just completely ignored that EU deadline; at least for the Mac Pro product.
So there was probably nothing solid there. Maybe the were mucking around with some early prototype mules but it doesn't look like they were doing anything around the other aspects that they would have needed to working on if they were serious.
Another issue that perhaps stopped Apple if they had decided to shift down to single CPU offering is that they wouldn't have been able to transition from 12 core to 12 core at the "top end" with Xeon E5 v1. v2 and TBv2 were a close to sliding into 2014 kind of timeline. [ At one point Intel had Xeon E5 v1 coming in 2011 ... it slid to mid 2012. which in turn slid v2 out to end of 2013. if v2 would have come in end of 2012 then perhaps Apple would have 'reboot' Mac Pro work earlier, but I think other more brightly burning fires in the Mac space got resources reassigned to those and the Mac Pro stalled out for much, if not all of 2011. ]
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I always thought the 2012 MP was supposed to be the answer for that but they gave up and made it a spec bump at the last minute.
The Mac Pro 2012 had the same basic case design as the Mac Pro 2009 which was probably designed in 2008 (the same year the rule was made ). There was a rumor in early 2012 from supposely from deep sources at Intel that Apple hadn't even touched the E5 v1 samples at all for macOS porting. If those were true there wasn't some shadow system coming that got aborted. Again if there was what happened to its GPU/video cards? Why did they disappear too?
The 2017 adjustments to the Mac Pro 2013 model (sliding the 4 core out of the rotation and moving 6 and 8 core down in price ) was very similar to the Mac Pro 2012 move. In both cases that is more "well we don't have anything move" . late 2018 and Apple ain't got jack. Late 2012 didn't have jack either.