An extension of house storage space, for homeowners, of 20 slots
A stat reset item that does not consume xp, and can be used anywhere (be careful, as when you use it, your stats go really low, and you could get killed, which could cost you xp).
I'm not sure of prices yet - but I know I'll be looking at the house upgrade very shortly - and you can buy more than one

As usual, you need Google Play to buy these items. But, they should be tradeable as normal items too.
EDIT: I'm fairly certain that the house storage upgrade affects all houses that account owns if used; but I'm not 100% on that, I'll try and get it confirmed. I know it was discussed, but chats have been very busy as of late with many, many exciting things going on (and they're not all here yet).
Edit (ardesia): compbatant confirmed all houses are affected by the storage extension, including the ones not yet bought. If you own a house and activate a house storage expansion, at buying a second house you will have expanded storage there too