Rear wheel bearing problem?

[Ivan141]

Hi guys,
My rear end has started to make rumbling noises when I take right corners so I think my left rear wheel bearing is worn out. Is this the noise you normally get when a bearing is worn out or is it something else?
It happened after a few laps of spirited driving on the slalom course yesterday (only noticed it after 100km's of highway driving).
I figured it's the bearing cause the diff would probably make noise in both directions if the internal gears where worn out.
I already ordered a new one for mucho cash so I hope that will solve it.
Please post your thoughts on this problem!