Seraphic-
1. The 650 Pro is rated for 720x480, correct?
Well it the same as 550 so that has be YES
2. Does the card have an onboard hardware deinterlacer?
There no onboard hardware deinterlacer just Edge enhancement if want lean more see here
http://www.videophile.info/Guide_EE/Page_01.htm 3. Will the card be out before this month ends and has the price been set yet?
There no tell what it going cost but best guest any where from $100 to $200 and when that going to happing who know.
4. If the Microsoft Resource Kit doesn't work with the 650 Pro, what would be the best way to get around the 4GB limit on video files created during a capture in Windows XP?
All video is limited by older OS filing system Fat16/32 which is 2GB/4GB unlike NTFS which is 2TB unless the codec use is limited which is the case with some file format.