Unfortunately, there have been no signs that Bretonnia have any place in
GW's plans for
AoS going forward. If this changes, I'm sure we'll discuss the heck out of it in here... but in the meantime they've been discontinued unfortunately (although you do have the warscrolls to use from the initial
AoS release).
See this link for the warscrolls:
https://www.games-workshop.com/resources/PDF/AoS_Compendiums/warhammer-aos-bretonnia-en.pdf
If you want to discuss Bretonnians further, it is probably best to do so in the Warhammer 8th edition board here:
http://www.dakkadakka.com/dakkaforum/forums/show/93.page
Obviously, if you want to discuss them for use in
AoS, feel free to make a new thread regarding your list / tactics / etc. Going to lock this one up to avoid any back and forth on the issue of
GW discontinuing races (we're hoping to have more threads devoted to
AoS in this area, and legacy
WHFB at the link above, rather than each devolving into a comparison of the two).