IDG Answers is a community of experts who are passionate about technology. Ask a question or answer one below.
The majority of the apps should. The ones that won't are the ones that use native libraries and didn't include x86 compiled copies of those libraries (probably not many that you actually use). That's how Intel came to that 90% compatibility rate figure.
Anything created that uses the official SDK shouldn't have an issue. That's the beauty of Dalvik.
I believe the existing GoogleTV devices out there run x86 Android. At least the Revue does. So don't worry, you'll still be able to play your Angry Birds Space.
Intel itself said it was targeting a 90% compatibility rate with apps written for ARM Androids. Or to put it another way, they were hoping at best that 1 out of every 10 apps won't work on their x86 phones. At best...
I haven't even seen one of these XOLO X900 phones "in the wild" yet, so I haven't had a chance to see how well they work. The specs look good, I must say. High mid-range if I had to quantify it. I looked at a few benchmark test, and they compare very well to other phones, in some areas besting quality devices such as the Galaxy S II and HTC One S.
extremetech.com did look into the app compatibility, and found that of the Top 40 "New Games" on Google Play, 36 of them worked on the X900. That's probably about as good as you get with most devices. I do suspect that older apps might have a lower rate of compatibility, but that is my speculation.