Update:

>> 3+ GHz
>> [...] this gives us some idea of what they're shooting for with the
>> next revision of the e5500 core. [...] 3Ghz or higher operation.

> Keep in mind that this clock rate is what more than two years ago they
> thought they'd be able to deliver the T5 at. This doesn't mean it really
> will come at that, not even that it's still planned to come at that.

e6500 core announced to run at up to 2.5 GHz:

https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=7901&forum=11

This is the same maximum clock speed that was announced for its predecessor, the e5500 core.