Yes cross-play and include PC!
I grew up using a joystick and various controllers for video games, it took me awhile to adjust to KB+M but the last shooter I used a controller for was Goldeneye on my N64 as I have adjusted fully to using KB+M for most games and especially for shooters. I even have a Razer Naga with it's 12 thumb buttons to easily switch weapons in games like Doom and Ion Fury or for abilities like we have here in BfN and the GW games. Adjusting to those extra buttons took awhile, I used Minecraft for that as switching to different inventory slots is less critical there than in fast paced shooters.
I do have 2 controllers for platformers and arcade style games though as I find KB+M subpar for those style of games. The combat in the Star Control games for example is terrible with keyboard but works great with a controller, as long as I turn that annoying rumble off!
Cross-play is already working fine in Paladins and it has the same anti-cheat as BfN and is also a team based shooter.