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you know the search function can do wonders...you'll find a lot of threads on this already.
 
add santa rosa to your search and it will provide a good deal of chatter and info on what you might expect to see in the next revision.
 
cool !

what are some of the new features gonna be ?

any guesses ?

The general rumours seem to be:

LED backlighting (better brightness, and battery life)
Santa Rosa (new chipset, increasing speed)
Speed bump, and baseline spec increase, possibly with a price cut like the macbook

12/13" form factor, possibly with a flash HD
H.264 hardware encoding (to make converting videos to an iPod/appleTV friendly format quicker, and not taxing on the processor)
Case redesign (from major goodness, to adding the nicety that is magnetic closing)

The top group are what I think are most likely
 
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