The PR update will be as usual and is based on no. of quality back links. But, i have heard about Google panda and other update may affect a website if it is over optimized.
No prediction for PR now it can update any time, I have great example for this check this site cricinfo.com its cricket match updated site if they create one today then in the evng they got PR 2 to 4, I saw so many time and then analysis this... And also seen few sites which just lunch and after few days they got PR, In the short I just wanna say now its all over to predict PR every 3 month it can be update any time all depend of your content quality and back links.......
I stopped trying to predict anything and planing accordingly. I started doing everything by the book and everything is fine from then.
We know... twitter has PR 10. How about google? He has PR 9 under twitter. So see and understand the components that make up the google pagerank. The important thing is there are a lot of backlinks to our website. There is no problem about unique content based on the niche or not at all. Importantly, the website is not subject to penalty or deindex. You can see google.com, Had google unique content based niche?