One can find my last Sina related news here:
There is a rumor today that Sina will let its Weibo division go on IPO early next year. The following two articles talks about it:
I don't know how reliable is this rumor. But those two web sites are somewhat reliable.
If this is true, this will be great news considering that Twitter is going to IPO. Sina could probably get a good reaction from Wall Street by hopping on Twitter's coat tail.