Elite Fourum! Our set-specific threads are the best place to do that.
SM2/SM2+: www.elitefourum.com/t/sm2-islands-awaiting-you-alola-moonlight-more-releases/15230/1
SM3: www.elitefourum.com/t/sm3h-battle-rainbow-sm3n-light-consuming-darkness/15742/1
Pokebeach is good for simple news, but here is better for actually interacting with other collectors.