From the Japanese Best Car Magazine.

Lexus LS:

- Debuting at the end of 2005
- Will have a base engine of 4.5 or 4.6L (so LS450/460?)
- There'll be a "GT" model with a 5.0L engine
- Design will be "showcar"-like

Lexus IS:

- Debuting in fall 2005
- Base engine: 2.5L V6; Upper: Yamaha 3.5L V6
- Same V6 as new GS, but will be tuned for higher output
- Width will be the only increased dimension

Personal opinion:
The LS in the pic looks like a chop of the LF-S, which I think is more suitable for the IS to look like.
The IS in the pic looks like a chop of the current IS with some headlight and grille alteration.
Again it's all speculation.

Source:
http://carspyshots.proboards2.com/in...num=1076291042

LS500GT:


IS350:

 

the back end of the is350 looks like a buik lesabre like that, I hope that doesnt make production. Other than that I like them

 

The picture of the red IS looks hot!

 

the new LS looks kool

 

a lot of these pics in the japanese mag, they are often just photoshop or so. it might be very different

 

I very much doubt that the LS will be THAT sleek and sporty. The LS thrives on its conservative luxurious
appearance. This design would have been suitable for the new GS although I still love the actual 2006 GS design. I would also expect the new IS to be better looking than that image, however it's still nice.

 

I can tell you that what I don't like is the Yamaha made 3.5L V6. And I'm not too fond of the rear end, either. Other than that, me likes!

 

They better not be ****ing with us!!! That would just be too awesome! A 2.5L finally returns!

And a Yamaha-influenced engine! Totally sick!! x9999999999999999999

sweetsc400, what do you have against Toyota+Yamaha? They've been working together since the days of the 2000GT, which is a legend. I welcome Yamaha's involvement.

 

I thought the LF-C was the next IS. This must be an attempt to shake us....work us into a frenzy then come out with the LF-C.

 

As I've said before, I no longer have any faith in these sketches after seeing the numerous renderings of the new GS, many of them from Japanese magaazines, and how different they look from the real GS that was eventually unveiled.
These sketches look O.K. but not spectacular, I sure hope the real cars will look better.

 

I'm afraid the 2.5 L will probably not be available here, just like the IS200 is available elsewhere but not in N.America now.

 

I disagree. In order to make the IS a true 3-Series competitor, they will have to offer a variety of engines and transmissions.

 

I totally agree.

and to me, that new IS rendition sure does look like the TSX.

 

I am highly skeptical about the information given by that magazine...or any magazine. Actually, I seriously doubt anyone knows what these two cars look like or know much about their specs.

 

That looks good for an IS, but not the LS.