Yes, because it will be NVidia's only course of action to take (besides releasing all sorts of "paper tigers" on the NV30). How much and when is anyone's guess though.
What's your current video card? If it's equal to about GF3 cards, the GF4 line doesn't offer much in the way of an upgrade so in that case I would suggest waiting a little longer for the Radeon 9500 (slightly lower clocked, half the pipeline version of the 9700 I think) which should debut at about $200. If you've a GF2 or older though, it would be a good decision to wait a bit for the Ti4400 to fall in price and then OC that sucker to 4600 levels.