Facebook's new Home launcher for Android is available April 12 as a software download from Google Play. HTC will intro the first phone to include Home, the $100 HTC First, on April 12 as well.
AT&T is the first carrier to announce specifics for the plus-sized, aluminum-clad HTC One.
Facebook's rumored mobile release will integrate the network into your Android phone in unprecedented ways.
HTC announced Friday that its well-received HTC One smartphone won't go on sale in the U.S. until sometime "before the end of April," according to an emailed statement.
Nokia has won an injunction against the sale in Germany of some HTC handsets that infringe on a power-saving technology for mobile phones.
Rumors say that the HTC One is headed to Verizon, and HTC confirmed that an unlocked version is coming for developers.
HTC's new One smartphone will arrive later than expected, and could lose any time-to-market advantage over Samsung's upcoming Galaxy S4 handset.
HTC and Nokia are separately expected to announce super-high-quality cameras in new smartphones expected to be unveiled the next week.
HTC has posted a countdown timer to the introduction next week of its HTC One smartphone, also known as the M7.