Thanks all, for your replies. Actually I need an iPad only by November, so perhaps I am holding out. I would like to keep it for 3+ years and I would hate SlideOver, Spaces, etc to reduce to restarting most apps.
Realistically, if your usage is high end, you're going to have to purchase a new device within a couple years anyway just to keep up. If your usage is NOT high end, then you don't need more than 4 GB of RAM and a current Pro (or even a current Air) will suit you well for years to come.
Also with desktop browsing coming to the iPad, Ram needs change too, right?
No, you don't need increased RAM for desktop browsing.
But then it would also suck to see no iPad in November and to just get the iPad I could have gotten 4 months before.
I would ONLY wait if you have reliable, fairly solid information on an upcoming release - at this point there is none for the iPad. For example, now would be a terrible time to purchase a new iPhone because we all know a new one is coming in September. With iPad, there really hasn't been any good, credible information about a new model, let alone a new model that will blow the current one out of the water.
Overall, I would say waiting until November is just going to deprive you of enjoyment of the device between now and then. You could wait until November, then be cautious and skeptical about buying a new model hoping for an early 2020 refresh and it goes in a vicious circle.
The current iPad Pros are amazing - if that's what you need/want right now, get one!
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under iPad OS 13, i get many reloads with multiple app instances...I think they should have put 8gb in such expensive device (iPad 12.9 2018)
You're getting that because it's Beta.
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2GB RAM started in 2014 with the Air 2, so it lasted 4.5 years as the base. Only the budget iPad now has that. By that logic the Pros might expect a RAM increase next year (the 2015 12.9” iPad Pro was the start of 4GB.)
I would hold off as I’ve said in similar threads, also expecting the base storage to go up. 64GB seems awfully low for a Pro at this point, so you might only need the base model at the next refresh.
Hold off to what point? There's nothing reliable that says a new iPad is coming any time soon.