Not that many hotels opened in the past month, but these are the ones noticed by the wiki. March seems to become even less impressive.

Feb 28: New York – The Draper New York, Tapestry Collection by Hilton (ex-Ascend)
Feb 27: Indiana – Home2 Suites by Hilton Indianapolis Keystone Crossing
Feb 23: Tucson – The Eddy Hotel Tucson, Tapestry Collection by Hilton
Feb 22: Equador – Hampton by Hilton Quito La Carolina Park
Feb 18: North Carolina – DoubleTree by Hilton South Charlotte Tyvola (ex-Hilton Charlotte Executive Park)
Feb 18: Michigan – Tru by Hilton Chesterfield Township Detroit
Feb 18: New Mexico – Home2 Suites by Hilton Hobbs
Feb 16: Ontario, Canada – Canopy by Hilton Toronto Yorkville
Feb 16: Virginia – Embassy Suites by Hilton Virginia Beach Oceanfront Resort
Feb 10: Texas – Home2 Suites by Hilton Flower Mound (15mi north of DFW)
Feb 08: Arizona – Hilton Vacation Club Rancho Manana
Feb 07: Spain – Via Sants Hotel Barcelona, Tapestry Collection by Hilton
Feb 01: Aruba – Embassy Suites by Hilton Aruba Resort
Feb 01: California – Hampton Inn & Suites by Hilton Marina

Yet another Ascend Hotel Collection property (Grand Hilton Head Inn, Ascend Hotel CollectionŽ (choicehotels.com) moving to Hilton (DoubleTree by Hilton Hilton Head Island). But you'll have to hang on until March of next year.