That would be the case with any technology, isnt it? All technologies keep on upgrading very regularly. And the general opinion is that if you have a requirement, go ahead and buy it. If you want to get it for luxury/bling, wait for the big releases, etc.
Right now, Tata and Dish are the big players, but Reliance may be coming out soon (no idea of the timeframes though) and as one of the threads here mentioned (quoting ET of course), that they will also be giving out LCDs with their package, which may cost upwards of 10K !!