It takes me forever to decide on the next vehicle to get so I've started thinking about a replacement for my 08TL when the lease comes due. (May 2012). Yep I'm looking already.
I have no idea what to get as a replacement. The current generation Acura designs are BUTT UGLY (no offense if anyone here has one). The only one'd I'd consider is the TSX and RDX but I'm leaning more towards 'No'. So that means venturing to non Honda territory for the first time in 9 years (once lease is up). So... here's the criteria and likes.
- I loved seeing the smaller premium brands that are available in Europe but not here. I'm hoping to get something a little smaller. I don't want to sacrifice luxury or technology for fuel economy and size.
- Should be 4 doors BUT not closed to a coupe so long as the backseat has enough room for 2 adults to sit comfortably.
- Price wise... no more than 40K and even that's pushing it. I'm happy with my current lease payments being $529 a month all in.
- Can not be BMW or Mercedes.
- Navigation system is a must.
- Not too boring looking. I like the design of the new Hyundai Sonata but am weary about buying Hyundai.
- A small crossover?
Happy suggesting!
Your time line would be good for some new Ford products in the pipeline
New Focus ST

I would mention the next Mondeo/Fusion car but this is basically in the same size category as your TL, and you say you want to downsize but not down grade. So I suggest to look at the new Focus sedan Titanium spec car, it has features more in tune with what you find in the E class luxury segment.
Also by this time frame it should be available with this new sweet 1.6L Turbo EcoBoost powertrain in North America.
The reviews so far from Europe regarding the suspension have been praising the new set up for not giving up the great sporty fun experience from the current Euro Focus and also adding in a very refined feeling set up , a more grown up ride as many have commented.

Video demo of the Nav system and MyFord Touch features in the new Focus
http://www.youtube.com/watch?v=DVj6vFrCm4k&feature=player_embeddedA Q/A video demo of the MYFord Touch in the new Focus
http://www.youtube.com/watch?v=SoJTFQ0i30g&feature=relatedVery impressive car with the smaller foot print you are looking for, without giving up the premium aspects you are used to in the TL, + some added features not available as I mentioned in many of the entry luxury segment.
The new Focus is worth a try if you can get your mind past the badge