Legend is replacing Horror Channel
Horror Xtra is replacing CBS Justice
Reality is replacing CBS Reality
Reality Xtra is replacing CBS Drama
Except it's not that simple. It depends on TV platform. See the tweet from @a516digital, see end of this post.
RXTV have an article that includes logos so this seems to imply they have a better source than the Digiguide listings which started the rumours.
Legend is going tonne a sci-fi, horror and fantasy channel, so it's more a rebrand of Horror Channel which is more content accurate, as Horror Channel didn't show horror until 9pm usually and filled its schedules with sci-fi and fantasy the rest of the day anyway.
In various places I've seen that Horror Xtra is only from 5pm, so there's speculation that on Freeview at least it's timesharing its slot with another channel, so there's potentially an extra space in the offing for COM7 refugee channels.
There's been a hint that PBS America is trying to get a 24 hr slot now their 24hr +1 is closing. Maybe it's swapping with CBS Justice and Horror Xtra will move to PBS America's space?