In a recent leak from Noanostalgia on X, it was revealed that Gan is planning to release a 52mm speedcube under its Monstergo brand. I cannot think of a 52mm speedcube released from a major cube brand any time recently so it is something new that some people might like.
The MonsterGo brand is Gan's budget brand, Gan sort of disassociate themselves with it and the name Gan will probably not be anywhere on the box, it is kind of an open secret that Gan produce MonsterGo products. The design is usually based off Gan's other products so I suspect this 52mm cube will perform pretty good and will probably be about £10 and magnetic.
Historically, we have seen a few other slightly smaller cubes, the popular budget one is the YJ ZhiLong which is 50mm, Gan also released a 53mm version of the Gan 11 M Pro, however, we haven't seen any magnetic 52mm cube yet.