Don't get too excited. It is not a runway extension per se but (and I'm sure I'll be corrected if wrong) an exercise in compliance with ICAO (?) recommended runway end overrun areas. There is, or was the last time I was in the terminal, a large display of the proposed works that, as you rightly say, see civil engineering works at the 26 end. I believe that there might be a slight increase in the TODA but it is in the order of 150m. I'm sure the Ronalsdway ATC posters can give more information.
The airport itself is still undergoing ramp concrete renewal to facilitate around 14 stands - and the terminal itself is in for a revamp - so there's plenty of overtime for the DoT boys coming up.
