Some news:
1. Chivas added a timer to release of gt500 2013 pack on their site.
2. They also posted an updated Suzuka track on their FB site. From what I see a fourth layout was added, and also wet layouts:
LINK
3. Dan Bucsa updated Audi quatrro 90 to 1.9. Find it on his site.
4. ERL made an update to Interlagos acu track. It is mainly a new skin. I think some texture were updated, and some new buildings and other stuff around the track (the tarmac update from RD goes nicely with it):
LINK
Edit:
5. Matteo from Assetto corsa racer on FB released a very nice pack of GT4 cars. Exige was available before and is now even better when updated, other two cars in the pack are MX-5 and Peugeot 207:
LINK