Why are almost all of the tech sites I've seen assuming the S3 screen will be 1080? Are there some strong rumours for this?
I find it highly unlikely for a few reasons.
The main reason is the Galaxy Nexus just came out with a 720 pentile display from Samsung. It's a bit early for Samsung to then pull off a 1080, especially seeing as they'd prefer to release the phone with an AMOLED Plus.
The 1080 would also suck juice like a whitehouse intern. Again, I can't see them sacrificing battery for 1080.
And last but not least, it's really not necessary, 720 on a small screen is plenty, so why sacrifice things such as battery to go 1080 instead of 720. I doubt the eye could really see much difference between a 1080 and a 720 and I'm sure it wouldn't be a deal breaker for many potential purchasers as 720 would be a big upgrade from the S2.