The only thing I know about the next expansion is that one will exist, and that it may contain a new graphics engine.
I've not heard anything else about what's going to be in it, when it will be out, or nothing.
I'd expect it to be more high-end content for the 60+ people (lowest zone would be like a Tier 2 zone?)
Maybe a new race, and/or maybe a new class.
They announced that they had another expansion in the works about the time they announced that LDoN would be released in October (So this is about July-ish), but has said nothing else about what's to be in it.
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Mindbender Llaffer Outloud
L70 ENC
<select name=Skills>
<option>78 past 1750
<option>272 from 2100
<option>Jewelry:300+Trophy
<option>Tailoring:259+Geerlok
<option>Pottery:256+Geerlok
<option>Smithing:256+15%
<option>Fletching:254+Geerlok
<option>Baking:252+Geerlok
<option>Brewing:251+Geerlok
<option>Research:202+Geerlok
<option>Alcohol Tolerance:200
<option>Fishing:182
</select>