Are you saying that the E18 may possibly be released by summer time and the next version by winter time? Is that a random guess? Where did you get that information from? I think at best the E18 would be released by the end of this year and the notional "E19" wouldn't make sense at this point at all. The only thing that could possibly be improved on at that point is sound quality, as I'm sure there'd be room to grow.
I asked JamesFiio/Feiao and these were what I got as a reply. I'm hoping for a release of e18 in late summer. I'm holding-off the e17 purchase and wait for the e18 due to Android compatibility. e19 supposes to be Fiio top dog, e12+a kickass DAC?
Current e18 threads: http://www.head-fi.org/t/628254/fiio-e18
Edited by Sko0byDoo - 2/19/13 at 9:13pm