Ok this is what i came to know.
The following is info as attained from a range of very reliable sources. Yet unconfirmed of course. So speculate if you will.

Zardari has had a half body paralysis. Kamran Khan (not one of my sources of course) on his show also said that he had recvd a call from US admin, perhaps Obama himself, post NATO strikes. During the call, he began perspiring and eventually collapsed onto the floor. After which he was rushed to dubai. What on earth was he told in that call? Leave it to you.

Now the inside news is that the army has threatened him and told him to put Bilawal in 'safe deposit' in Pak while he is away. This is why Bilawal arrived the day Zardari left and has lingered on despite nothing more than trivial party work. Bilawal will only be allowed to leave if Z-boy's back. This is to ensure the family doesnt run away like it always has in the past.