Asian hardware site HKEPC says Intel will soon launch a dual-core Celeron processor that runs at 2.6GHz with 1MB L2 cache and a 533MHz FSB. The part will likely take the 5xx model number series.
A picture included in the post mentions a 2.66GHz Pentium 506, again a model number not included in Intel's current price list, for HKD995 ($128). Again, the lowest-clocked 5xx series Pentium currently available is the 2.8GHz 520. That price puts the part down in Celeron territory - the 3.2GHz Celeron D 351 costs $127. The mysterious 506 is listed in the piccy - of a Hong Kong PC retailer's price tag - as a "Pentium D (dual core)".More details at The Register