There are a number of cooling techniques that I've seen research on the could be used. Liquid Micro-channels, vibrating heat sinks etc. They could come up with something, but I'd guess the best it is going to let you do is put 10% more power in there to maybe 60W. There really isn't that many processors to choose from in the 45-60W range.I know everyone is looking at the thermal output of new chips to base their ideas on, which makes total sense.
If in fact they did figure out something cooling wise, it upsets the balance on that is all I'm saying.
Which is why I think they may take a 45W part and make a custom production run at a higher clock speed to get better performance but stay within their power thresholds.