You bet your rear end it is. Check the website source - it's the official League website. The new Star Guardian skins are on the PBE and will be going live soon.
Lulu top, Lux mid, Jinx adc, Janna supp, Poppy jungle, a bit unorthodox but hey, works. Man I wanna see it in game.
Same here - I'm fairly certain folks have been doing that on the PBE already. It doesn't help that Poppy is a better top laner than she is a jungler, but it would be awesome for someone to pick a full Star Guardian comp and win.