Actually it is up to about 2-3 a month. Also a number of others are known to be coming this year, but have no official date (e.g. More Disney 3D releasese).
US Releases for March
Ultimate Wave
Yogi Bear
Tangled
Releases for April
Tron Legacy
Gulliver's Travel
Releases for May
Green Hornet
Gnomeo and Juliet
Drive Angry