I don't think so. I believe it's just the model you purchased. If you look at their website, there are two other 45" models available w/the higher resolution. As well as their 57" and 65" screens. (WOW!)
Those other models may be from last year, but I'm betting that they're still available while their replacements are enter the line up for this year. It's all up to you, if you like it, keep it. If not refund it. But I'm betting that 45" of Flat-screen goodness is looking pretty sweet on your bedroom wall.