February 22-25 is the Mobile World Congress. It is common that most of the top tier phones coming in the first half of the year are announced at this event. The event itself tends to bring lots of wireless carriers from around to global to one place making it relatively easy for manufacturers to get their product in front of the buyers.
In terms of what phones to expect, HTC, LG and Samsung typically launch their flagship phones late spring/early summer. Typically MTS has seen these phones in the April-June period is years past. It is possible we will see a surprise this year from someone like Huawei, manufacturer of the popular Nexus 6P.