I will wait and see what the car drives, feels and looks like before writing it off. If it is better than the F30 3 series i will buy it - simple. The XFR took on the E60 M5 a couple of years ago and won its fair share of comparisons.
All i'm saying is that Jaguar have the capability to build a credible F30 challenger - and no one knows how good/bad the F30 is going to be - if it continues down BMW's current path of producing less driver focussed cars in favour of appealing to the masses then the Jag may be an option.
2011 AW E90 M3 DCT - Current
2010 JZB E90 M3 DCT - Sold
2009 6MT E90 LCI 335i M -Sport - Sold