The TDP for the mobile versions, once they appear, is likely to be much less (and much less powerful).
That wasn't the case for the 10-series. The mobile counterpart was almost as powerful as the desktop version and their TDPs are the same too.
That's why I'm eagerly waiting for the mobile release to see how manufacturer cope with the increased TDP but neither solutions (larger form factor even for single GPU or lower performance) that I could think of are satisfactory.