Brian Waters has a $2 million roster bonus due tomorrow, according to Adam Caplan of Scout.com.
Waters is turning 33 years old so I would say any big roster bonus day is important for him.
This move doesn't necessarily mean anything one way or the other. For example, last week the Jets released Thomas Jones because of an impending roster bonus. Then this week the Colts paid Ryan Lilja a $1.7 million roster bonus and then released him.
That said, it does at least suggest that the Chiefs plan on retaining Waters for the time being. If any roster move like a release or a trade were to happen, it would usually occurs before that date.
I do think the Chiefs will keep Waters in 2010 though I do wonder whether someone like Chan Gailey could use a veteran offensive lineman. The Bills have one of the worst offensive line situations in football and he might be interested in a stop-gap.
It may seem unlikely (and it probably is as are all hypothetical trades in the NFL) but the Chiefs have shown they're willing to release big name Chiefs if the price is right.