Welcome to the forum Lyndon, you'll find the members on here are a friendly and helpful bunch :)
I would like to think that over the next 4 months the price will drop especially when we get towards the summer months. In terms of negotiatation I think this will depend on whether or not you are taking finance. However my experience is that the German manufacturers are less inclined to negotiate and reduce the price whereas I've found manufacturers such as Vauxhall are willing to negotiate.
If you are taking finance then you are more likely to get a better price. I.e money off or more for your px. Obviously you've also got the scrappage scheme going on at the minute with Audi which could be worth considering depending on the value/age of your current car.
Also you should find the Q5 models that are available from Audi approved used are better than those more private garages but obviously this is not always definite. But they will have full Audi service history, low miles and will.come with warranty.
Hope I've helped :)
Cheers
Steve