I think I'm going to overlook the fact that it has Android, because I'm just going to use it like I used my X1060. For music and music only, which this player was meant to be by Sony. No matter how many sound files I had on my Walkman, loseless or lossy; how I tweaked EQ, presets, or sound enhancement settings, it never lagged at all! I think we're exaggerating on it having Tegra 2; Acer and Motorola tablets didn't lag or reboot because they used Tegra 2? They seemed smooth overall (from researching a few many threads on XDA). You don't expect AK100, ANV3, or iBasso to play Angry Birds do you?
Maybe Sony should have just gave it Walkman's UI (present in X1000 series) and called it the X2000 series (X2040 16GB, X2050 32GB, X2060 64GB), give it a 3.5" screen or smaller, because if they put Android as OS, some techy or geeky people are gonna expect it to perform like their smartphones or tablets, and gonna wanna do all kinds of app-oriented or web/internet things with it; make it a pure DAP, because hey, Android enthusiasts are so hard to please sometimes! It'll probably be cheaper if they did that, too! But don't forget, this is just a DAP with a price tag of some 300 euros (pre-order)! It doesn't even have a camera, so why bother to talk about SD card slots? How long are you going to be away from your computer or home to need over 64GB of music files on it? Or you wanna put other files other than music on it? For that you can buy a really fast performing tablet for 129 dollars instead, some of them Chinese ones even have dual micro-SD slots (Cube, Onda, Viewsonic, Huawei). Don't expect the Walkman to be your twitter machine or facebook central; you probably already have a smartphone for that!
Sorry for the rant, but in my honest opinion, we should see it as this: Sony is offering us a hi-fi DAP, that has the ability to do more than its nature; by giving it Android OS, users can use it to their convenience (maybe set calender, look up some blogs occasionally, or download some neat/useful audio-related apps like PCM recording apps or sound-simulating apps). It really isn't your "developer" device, but the Android is just there to make us happier, not to complain about it having the outdated Tegra 2 (which I find really, really silly). I'm sorry if I'm sounding offensive, but some people take things for granted and expect a DAP to do more than its job, just because it has Android!
On another note, you guys check out the DAC and micro receiver and hi-fi speaker system Sony announced as well with the F886? Looks kind of overpriced to me, especially that DAC. Don't know how it'll sound considering it's Sony's first computer/desktop oriented DAC.
http://www.theabsolutesound.com/articles/sony-backs-hi-res-audio-big-time/