Well I'm surprised as well - particularly being a Toro Rosso fan. However, I'm really excited about this news. Looks like with this news Trulli will be "re-confirmed" for Lotus again. I really thought next year's line-up should be Alguersuari and Ricciardo. I know I've raved about Vergne for some time, but he got beaten to the Formula 3.5 title by Charles Pic, right at the last. That was disappointing for me.
I'm still entertaining the thought of a Vettel/Vergne line-up for Red Bull in 2013. When Red Bull pull out, V will back them.

It's awesome news for me. I liked the Red Bull line-up with Webber and Vettel initially. Now I've been following Vergne (was his friend on FB

) for a couple of years, coupled with another Aussie, equates to a dream pairing for me. (Although I'm not happy with Webber anymore).
This was an article I wrote for the front page a while ago, where I laid out some of Red Bull's options for the future. Back then I was really excited about Vergne, and it will be a thoroughly enjoyable season for me - I may even completely switch my allegiance to them.

(Although would be really supporting Vettel to make it a hattrick.)
http://www.forumula1.com/2010/f1/f1-news/red-bull-junior-academy-paving-the-way-for-future-champions/So - Alguersuari to HRT Then? It really is disappointing that Algy is going, but you know what - at the beginning of the year we were picking Buemi over Algy. Then towards the end Algy started to improve... But are you and I convinced?
Red Bull are desperately looking for a replacement to Webber, I feel (read I as an also-Red Bull fan, am looking for a replacement for Webber). It's quite simple, Red Bull won't go for one of the established names on the grid. It's not part of Red Bull's philosophy. Dietrich did not throw money at a driver development program, and a B-Team for nothing. And I think that the gamble with the previous STR pair, has gone on long enough.
And what about D'Ambrosio to Williams?
There is also some speculation here that Bianchi could be moving to Force India, for testing.
They have to bloody well move on with it and make an announcement soon. If Hulkenburg racing is not part of that announcement - then once again - I repeat - a tragedy for F1.