Sorry for this delay, but we had a good intention to improve the UK grid upload process by incorporating it with the UK ordinance data which was released. We asked to get the data, told to wait 28 days for its arrival, but it never arrived. Twice. So now we'll revisit the issue and see when we can do it. I'll have to update as to when we can schedule it.
I've been wondering this too ... since the update was due to start in May I slowed up my map editing. Sadly nothing has happened and here we are a month later with no announcements from the Waze team.
Please don't leave us in the dark. If it's going to be days/weeks/months that's fine but it would be nice to know so I can get on with map editing.
Also ... since iOS4 is out today for iPhone, when can we expect to see a multitasking version of Waze (assuming it's possible). A new version would be most welcome as v184.108.40.206 is not at all stable on iPhone with frequent crashes and has an annoying orientation bug (for those who use it an landscape mode) that manifests after every call or crash.