Are you referring to a ban on new magazines over 10 rounds? Ah,
*More single stacks ala PPS and Shield for CC. Also the smaller Glock, M&Pc and RUger SR9c style as well and their height is already short and its advantageous.
*You'll still see the big boys (full size double columns) but the only magazines available will be ten rounders.
*Might be more of a migration to bigger calibers. In addition to the 1911 platform we've seen the usual plastic gun suspects come out with .40 and .45ACP versions recently.