It looks like Apple's international iPad supplies have taken another knock; the company had updated their UK, Canadian and other online stores from estimating a June 7th delivery of new iPad models to merely "June". The move follows a previous change in delivery date for online preorders, which saw estimated shipping shift from May 28th - this coming Friday - to June 7th.
Apple themselves have made no official statement with regards the change in availability, but it looks like strong preorder demand has meant that those buying an iPad for home delivery shouldn't necessarily expect it in time for June 7th. We're guessing Apple will update the shipping estimates when they have a better handle on their stock levels after the in-store debut of the iPad WiFi and iPad WiFi + 3G at the end of this week.
The company have promised that there will be in-store stock available, though strictly on a first-come, first-serve basis. We'd be interested to hear from anyone ordering an iPad online (outside of the US) as to what their order confirmation says they should expect for delivery; let us know in the comments.