In my opinion, nothing will change in how Land Rover and Jaguar are currently operating. Both have a positive outlook and are looking to expand their lineup by targetting a broader segment of the international market.
Here's the production schedule that was leaked after the deal was closed:
2009
Jaguar
For 2009, Jaguar will roll out an R version of its all-new XF sedan, plus an up-rated and XKR — nothing really new there. In addition to the new 5.0-liter supercharged V8 — delivering 500 horsepower — a naturally aspirated version of the same engine — producing 380 horsepower — will also be offered in Jaguar models (though it's unclear which ones).
Land Rover
Changes scheduled for Land Rover next year include a revised Range Rover and Range Rover Sport. The SUV's interiors will get the most attention, but Jag's 5.0-liter V8 will also be added under the hood.
2010
Jaguar
Jaguar will launch its all-new flagship XJ sedan in 2010. The XJ will take on some styling cues from the XF, but will remain more luxury-oriented than the XF. The new XJ will remain the same size, but its interior volume should increase thanks to better packaging.
Jaguar's ill-fated X-Type will finally get the ax in 2010. As previously reported, U.S. sales have already ended.
Land Rover
The LR3 will see a face lift in 2010, with a heavy emphasis on improving interior quality and fit and finish. Jaguar's aforementioned 380 horsepower 5.0L V8 will likely find its way under the 2010 LR3's hood, too.
2011
Land Rover
Land Rover's LRX concept will make production in 2011, but it remains unclear what Land Rover will call it. LR1 is in the mix but could be too entry-level and, on the opposite side of the coin, LR4 could be too up-market. Whatever Land Rover decides the name the SUV, the road-going version of the LRX will have a hybrid option.
2012
Jaguar
Jaguar's long-awaited throw-back sports car will finally make production in 2012. Currently dubbed the F-Type — although the production model could be called the XK-E — Jaguar is currently deciding whether to base the car on the XF or XK.
Land Rover
For 2012, a seven-seater version of the LRX is possible. Details remain scarce, but Land Rover is said to be aiming for the Mini Clubman's uniqueness.
2013
Jaguar
The range-extending Jaguar XF coupe should bow in 2013, although it still needs the green light from the company's new owners. With the XF sedan bowing this year, it begs the question why the world must wait until 2013 for a two-door version. But then again, it took Cadillac a while to produce the CTS coupe.
Contrary to recent rumors, there are no plans for an XF drop-top or wagon.
Land Rover
Land Rover's flagship Range Rover will be completely overhauled for 2013, and the changes will see the SUV become larger and more stylish. Perhaps the most staggering news about the new Range Rover is that it will sticker for an astonishing $200,000, thanks to its Bentley-like appointments. But despite the Range Rover's growth in luxury in size, fuel economy will see an increase — due to the use of light-weight materials and an available hybrid powertrain.
2014
Jaguar
2014 should see an all-new XF, complete with an all-alloy body construction. Little else is known about the next-generation XF but it will be designed alongside the 2015 XJ to keep costs down.
Land Rover
An all-new Range Rover Sport will bow in 2014 and will also switch to an all-aluminum body.
A new Land Rover Defender is also a possibility for 2014, although nothing is set in stone. However, Tata is said to be carefully considering the project as the Indian automaker has a growing interest in a rugged 4×4 model that could be sold throughout the world — think Toyota Land Cruiser.
2015-2016
Jaguar
An all-new XJ will join the Jaguar lineup.
Land Rover
Land Rover is due for a new LR3 sometime in 2015 or 2016, although it remains unclear what platform the new SUV will ride on.
(info taken from LeftLane)
I personally like both brands, and I think Tata will pull it off well - or I hope so.