Neither will be in the PS4.
SSDs are great for sure - low power consumption, very fast, no noise etc. But they won't be in the PS4 because they are simply extremely expensive - the price/capacity ratio is orders of magnitude worse than HDDs. And prices won't drop that fast.
The solution the PS3 already uses is better, because it is more flexible and already allows for SSDs: You can use ANY storage that you can plug into a standard 2,5" SATA bay. So the choice is up to you: You can either use a standard HDD with lots of gigabytes and low prices, but if you really want the benefits of SSDs, simply buy a 2,5" SATA-SSD.
And integrated Android is highly unlikely for a stationary game console that doesn't even have a touchscreen. If anything, we might see the return of "Other OS". That would be a more flexible solution and would enable running Android as well.
Here is my prediction what the PS4 will have: It will ship with a camera/microphone combination similar to the Playstation Eye, but probably stereoscopic 3D and HD. And it will probably also have a split motion controller like PS Move and Wii.
