I haven't seen the Singleton 10 YO bottled in bottles of 70cl, but only in 1L version. In addition to the 10 YO, Auchroisk released one vintage for Japan and was sold for about £180 last year.
Regarding the Singleton 10 Y0, one bottle was sold for £100 last year during the speyside whisky auction. From what I heard, the Singleton of Auchroisk is better than the Auchroisk F&F. Also, it is very unlikely that there willl be a further Singleton Auchroisk, since Diageo has just lauched the Singleton of Glen Ord.
To come back to your question, I don't think that the price will increase above £100 in the next 5-10 years, since Auchroisk is a rather unknown malt.