As reported over here, AMD Athlon XP processors with 2600+ and 2700+ model numbers appeared in Japanese retail. Both CPUs are intended for 333MHz system bus and run at 2083 and 2166MHz respectively. It worth to mention that there are very few 2600+ chips with 266MHz FSB support all around the world at this time, hence, it may eventually appear that AMD will offer its products with this model number only for the 333MHz system bus.
The Athlon XP 2700+ processor is priced at ¥50800 ($420), while its lower speed brethren costs ¥42800 ($354). It seems that the novelties are a bit overpriced, since officially AMD sells such devices for $349 and $297 respectively in quantities starting from 1000 pieces.