I have asked in a couple of shops (Lakeside and Uxbridge) and they both have said o2 will be bringing in new WP7 units but have no idea which ones yet. I can understand the Mozart and HD7 not being on prominent display at this time because they are coming up to a year old, hopefully when they do get some new models they will be on display.
Me to, I have been phoning almost every day for both my consumer account and my business account asking about and new WP7 devices and all of the operators have been clueless. Come on o2, this is the reason I left you once before when you got the ruddy iDevice exclusivity and forgot about everyone else. Don't do it again.
I have given up on O2 in terms of their support for WP7, they are totally focussed on iphone (and the odd android device, I even read that they will not be carrying the new Nokia WP7 phones when they arrive next month. Unfortunately, I still have 12 months of my contract to run, I will be cancelling then unless things change. In the mean time, I got myself an unlocked Titan and stuck my O2 SIM in it - it is an awesome phone, perfect for me.
Mind you, in O2's defence, none of the other UK carriers are going big on WP7 very few are stocking the new range and if you go into stores (in Manchester at least) they always try to push you towards Android or iphone, many staff at these shops know nothing at all about WP7 when you ask, most still equate it with windows mobile, Microsoft have done a very poor job in educating and incentivising (lets face it, thaat's what counts) carrier retail staff in the UK