If you like your E-420 a lot, then I think, you would like the upcoming E-620 more than 'a lot'.I must say that the E-620 is the first 4/3 DSLR to get me take out my $$$ even before it is available.
I am into 4/3 because of the small and light advantages it can offer, thus the E-1, E-3 and E-30 didn't work for me while I always wished for the guts of these higher end 4/3 DSLRs to be placed into something the size of E-4XX/5XX. For anything larger, I will rather go for FF or a DSLR with a superior sensor such as the S5 pro. I like my E-420 a lot but it is a little limited by the lack of IS, narrow DR, smallish VF and slow AF speed.
Short of weatherproofing which is not that critical, that has become reality with the E-620.
I think that Olympus just saved their 4/3 platform with the release of this camera.
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