Today's new issue of the Radio Times confirms in the "Next Week" section that Asylum of the Daleks will be broadcast on Saturday 1st September.
As well as an interview with the stars, and Steven Moffat's exclusive episode guide, there will also be a free Dalek Wallchart. It will be on sale from Tuesday 28th August.
Update - apologies but this post got a bit conflated. Today's issue has a "coming next week"section at the back, and this is all about the return of the new series - therefore the programme must be returning on Saturday 1st September.
It is the issue released next week (on the 28th) that will have the interviews / Moffat episode guide, as well as a free Dalek Wallchart. Don't know if this is included in the magazine or if you have to send off tokens. I am assuming there will also be a Doctor Who cover.
By the way, The Doctor, The Widow And The Wardrobe is repeated on BBC3 at 7pm on Friday 31st August - which also ties in with a 1.9.12 launch date.