Is there any reason for them not to update both at the same time?
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I bet that would be to update the MBPs and MBs with a somewhat big announcement (which is seemingly different than usual; I get the impression they quietly release a lot of the updates) to compete with other popular brands like HP and Dell because the back to school market is going to kick into high gear between June-August. Some people have said that they will wait until late July, August or even wait until Leopard is released, but I think that's pretty ridiculous since many colleges start in August. IMO, that would be a stupid mistake to make, especially with so many first year college students who are open to buying a Mac.
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Perhaps I'm wrong, but I've been silently watching these forums, the rumor sites, the buying guides, blah blah blah and after reading so many opinions, it sounds like the updates are coming in 4-6 weeks.
I agree! I very much expect (hope... take your pick) updates to both the MBs and MBPs before mid-July. Both units haven't been updated since September-October of last year, and both are "competing" in the most active segment of the market. Both lines are also prime sellers for college students and others looking for a computer at the end of one school year and the beginning of the next. Other than a transition to Santa Rosa, I don't, however, see big changes or major new real features (like Robson FLASH cache, LED backlights, Blu-Ray/HD-DVD drives, or the rumored mini-MacBook Pro) until perhaps the fall and the release of Leopard right before the Holiday shopping season.
Where I seem to differ from others is my little prediction that we will see an update to the consumer MacBook before WWDC and thus also before updates to the MacBook Pros. I don't think that updating the 13" MBs just a few weeks before the 15"-17" MBPs will hurt sales of MBPs at all. If you are in the market for a 15+" Pro starting at $2000, you probably aren't looking at a $1000 13" MB, and vice versa.
That's just my two cents worth.