I am *so* pleased to hear of these planned improvements! The park is fantastic, but it is very much a case of 'what it used to be', as the theming in areas is falling apart and the park in general doesn't look very well kept (and that was with me visiting during the first few weeks of it opening for the season!).
I found the SLC to be painful, and not pleasant in the slightest

as a rule of thumb I shall avoid all Vekoma SLCs from now! In fact, I think I'll just avoid most things Vekoma (Goudurix is not excactly the smoothest thing I've ever ridden, either).
Bandit was pretty dire, too - I ended up winded half way around from the fact I laughed so hard at how diabolical it was, coupled with severe jolts from the track and train!
I loved Mystery River, and am very pleased they are giving the attraction some much needed TLC - with a bit of paint and a touch up on the animatronics (fungus ftl), then that thing could be superb.
Nickland - two attractions? Could they really fit anything else in there?!
*gets on knees and prays* Mack launch coaster, I beg of you!!