Clark and ET
I am not so sure about fomite transmission. The main source would be contaminated chilled food that is then not cooked before eating or contaminated handlers, according to the Cases reported in China which I posted above.
As to longer periods of isolation, I guess you would need more data before the policy is changed. The first two cases described are less worrying than the presumably unconnected 6 cases with no clear travel history or contacts from travellers.
I also thought that the new variant is more sticky and therefore causes infections at a lower level of exposure.