This screenshot was taken from the HTC UK Twitter page. It is clear at this pic that they will also gonna announce something on March 1 for the upcoming MWC 2015. No details yet on Barcelona time and if can be viewed via livestream.
Rumors say that they might release the HTC One M9 with rumored specs like the 5 inch Full HD display, Android 5.0 and powered by Snapdragon 810 processor.