They have been available for several weeks now. I have not played with one yet but customers don't seem to be complaining. I know this post doesn't offer much but until I do a comprehensive set up of one I can only go om 5010 and 6010 experience which was very positive last year.
We have the 6020 in stock for a while and ordering has been no issue so your local guy shoud be able to get them. We have a 6010 and 6020 side by side, very little difference a little in brightness but that could be because the 6010 bulb is older also. The glasses are a bit nicer though.
I was in Theater Xtreme in Draper, UT this morning and they had a whole pile of Epson 6020's. The brightness seems to be about the same but the contrast ratio is drastically improved over the 6010 I had.