If the park are going to rebrand and change thier official logo, then all I ask is that they do it properly. It really bugs me that, Alton have had a few variations of logo over the last few years, and this is clearly visible across the park where this is such a mish mash of AT logos!
If they're going to change it, not only do they need to update all new stuff, like media, stationary etc. But they need to ensure the brand is consistent throughout the product. To avoid confusion, etc.
For example, the company I work for Powergen, recently added the strap line "A company of E.on" to thier logo. This was planned with milatary precision. Over night the branding changed, every item, bill, leaflet, poster and mousemat was updated and every trace of the old logo removed. Customer's instantly see the change, and there was no trace of the old look.
The moral of the story, if your going to change your branding, do it properly. Not half a job