Yes, we added White. Hopefully, he is the backup to Vereen and a fine receiver, replacing Bolden in that role.
As of now, we have little camp competition for roster spots, other than from UDFA's. Many think that the UDFA's have a chance to make the roster. If so, we would have added more than White.
In addition, several running backs have been brought in for tryouts (Bush, Leanard and another). So, between the UDFA's and the free agent tryouts, it is clear that Belichick wants some competition for Bolden and Develin. At very least, he wants competition of someone is injured.