I think there is a chance the Texans keep 6 WR's this year since Bradford is in the final year of his contract. The Texans need to groom a replacement and it seems that they have more talent at WR in camp than in years past. It's true that they started the first season with 5 WR's (J. Gaffney, C. Bradford, J. Lewis, A. Black, S. Gideon) on the roster but by the final game there were 7 WR's (A. Harris, C. Bradford, J. Dawson, F. Murphy, J. Gaffney, A. Black, J. Lewis) on the 53 man roster.
Last year the Texans carried 4 HB's most of the season, but this year they will probably only keep 3. I think that extra roster spot will go to a WR this year.