Source
... Intel would officially release Pentium E and Celeron 400 product lines on June 3. ...
As an Intel?s expectation, Intel Core products is hopefully exceed 50% of the total shipment during Q2 2007, expecting a crossover to the previous-generation product. Since Pentium 2000 and Celeron 400 family are going to release in Q3 2007, it?s expected that the shipment share would further increased to 80%.