I don't know for sure, but I would expect it to appear in the Steam sales.
It has done so in the past, and honestly for a game that is over a decade old (yes, it's changed drastically over that time) I'm not sure you can reasonably charge full price - at least on Windows, consoles is a different issue - for too long before the revenue drops.
The question then is how much a discount will you get if it is on sale. Previously you could have picked up this gem for as little as £7 (GBP) which is an absolute steal. I don't expect it to be dropped that much but it's £38 (GBP) just now, so it would take a 80% discount to get it down to the previous sale price, I'd still expect a decent chunk of discount if it does appear in the sale.
For reference, the next Steam sale starts on the 27th (about 4 days from now).