Yes, we will continue to beta test our HD offering of sports packages—including NBA League Pass and NHL Center Ice—with X1 customers for the for the 2017-2018 season. The HD betas will be available shortly to X1 customers who subscribe to the individual packages. On the TV box, you'll be able to find the HD streams via a virtual channel above the SD NBALP or NHLCI channels in the guide, or say "NBA League Pass HD Beta" (or "NHL Center Ice HD Beta" if you're a hockey package subscriber like me :-) into your voice remote to get to the team collections screen.
On mobile and web devices, the channels will appear directly in the guide at the bottom of all the in-home channels (just above the first TV Go channel). You can use the Channel Finder on iOS or Web to jump to these channels or tune to them directly, and of course you'll see the listings in the Games tab when you search for your favorite team. Each team gets its own channel.
Keep in mind that blackout rules do apply—but when there's a blackout, it usually means the game is streaming on a local channel anyway.