Reuters says Stelios will give a press conference on Tuesday. It is not clear which operator's infrastructure will be used, although Reuters mentions the support of danish operator TDC. Pricing model so far seems to be a pure flat-rate, available 24/7, with the aim of cutting the current UK users' mobile expenditure by half.
Update on 10/08/04: The easyGroup web site states that in addition to the entry in the UK market, easyMobile will be launched in another 11 European countries. The press conference is at 2pm today (UK time).
Update2: easy.com carries a new press release and explains a bit more the rationale behind the TDC partnership.
On another note, Astel reports that Belgium is going to have its 17th MVNO with fixed-line and ADSL operator Versatel. I believe the record today is in Denmark, which has 19 MVNO operators (a cut-throat market...)