The Republican will be in control of redistricting 196 seats while the Democrats will only have control of 49. If you are wondering why the math does not seem to add up it is because the rest of the seats are done on bipartisan or neutral basis.
"the Census Bureau announced the new distribution of House seats reflecting population data from its 2010 survey. As a number of news outlets have noted, the reapportionment combined with Republican gains in state legislatures and governorships last month have given an edge to the GOP. In total, Republicans have control over the redistricting of 196 Congressional seats, compared to 49 for Democrats -- the rest will have to be done on a bipartisan basis."