Florida is supposed to have an "independent commission" for redistricting. I'm not sure exactly what that means, but if it means unbiased redistricting Dems are bound to pick up a few seats. Right now Republicans control 19-6, and Florida is a near evenly split state. In a perfect world the new delegation would be 14-13 GOP, but there are too many majority minority districts to do that. Dems should be able to pick up at least a few seats here.
As krazen1211 has bentioned, Amendment 6 merely sets some constraints on the GOP legislature, which still draws the districts. From the perspective of a left-leaning realist, while I wish the Dems would be more competitive for the congressional races in Florida, their geographical distributions (concentrated in Palm Beach and Broward counties, non-Hispanic parts of Miami-Dade, minority and white liberal portions of Orlando, Tampa and St. Petersburg metro areas, black and college areas of North Florida) mean that while being competitive for presidential and statewide races, they tend to be at a disadvantage on district-based races like the US House or the State Legislature, as attested by my on-going series of my proposed state legislature redistricting maps.