More details are expected to be announced on Monday, however, some of the press in the UK are already reporting that the new stadium will have a capacity of 35,000. It's also been reported that the stadium will feature a retractable roof and seating, so London could be gettin' its own version of Arena 92. Can't wait to see this. 
From The Times:
From The Times:
The proposed stadium is understood to be in White City, near Loftus Road in West London, and will have a retractable roof and seating, allowing it to be used for concerts and other indoor events, The Times has learnt.
QPR said it would put the brand “on a global scale” and they believe that the extra income generated from the 35,000 capacity — compared with 18,360 at their present site — together with sponsorship from a naming-rights deal and improved corporate facilities will help the club to maintain their status in the Barclays Premier League.
The ability to turn the stadium into an indoor arena means that they will be able to compete with the O2, in southeast London, to hold concerts and exhibitions to generate further revenue. Loftus Road is expected to be sold off for redevelopment into housing, although there may be some restrictions on the site that limit its value.
Tony Fernandes, the QPR chairman, has already announced plans to move to a state-of-the-art training ground next summer and has now turned attention to the new stadium, likely to cost about £180 million.