In Network Vision, number of sectors tends to remain unchanged -- still typically two or three sectors. Number of antennas per sector, though, is definitely changing. In most cases, Network Vision antennas are being deployed at one per sector, while legacy antennas usually ran three per sector. During the transition, one of the legacy antennas comes down to make way for the new dual band Network Vision antenna. So, that loss of one antenna per sector could certainly affect legacy RF propagation.
We do have several existing threads here with pics of Alcatel-Lucent, Ericsson, and Samsung deployment antenna plus RRU configurations in various stages of completion.
AJ