I have been copying stuff about the Eve for about a month now before I bought the phone and I noticed on another site (not sure which one, sorry) that said the following:
"Just a quick note - in another of the Android developers forums the hackers are quite convinced that they'll have a functional android 2.0 for the Eve within a couple of months! BUT!! IMPORTANT!! YOU MUST NOT UPGRADE TO 1.6 if you plan to use their hack to upgrade to 2.0. This is because the "secret code" to get to the root menu seems to have changed between 1.5 and 1.6, so you wont be able to hack 1.6 until someone leaks that code...
Just a heads-up :-) "
Not sure if that is correct or not but I think I will hold off for a while on the upgrade until I can find more information.