there is this rumor going around these days: Rumor: Windows Blue will help battery life on Intel Haswell PCs? - Neowin
It's scheduled for Q3 because of windows blue, and the combination of windows blue and intel haswell processors are said to drastically improve battery life of notebooks and ultrabooks...
My guess for haswell would be a 10-15% performance increase from ivy bridge, nearly 30-40% improved graphics with intel HD4600, a better battery life, and hopefully less heat producing.. (Ivy bridges are smokin hot when it comes to heating..

)
well that's weird, a core i7 labelled as "Entry-level"..

wonder what i3 users will be thinking then, or worse, what about core2duo people??
Well that's where the Twist comes in. Hasell's will have much better IGPU performance than IVB's. But when someone's purchasing a Haswell based Laptop , its certain that it'll be expensive. And When someone's purchasing an Expensive Laptop won't he combine it with a powerful Graphic Card. ??
And I think after using an Alienware he won't be thinking to downgrade to HD4600.
Although I agree about the Heating issue with IVBs.They tend to get super Hot at full utilization.!!
However the Tech always gets obsolete within an year. SO what's the point in waiting ?? If you need something , go and get it. If you can wait , you'll always get better options.
So if he can wait till its release and can spend the money , then there's no second opinion.
But that's just my 2 cents. One can have different opinions on this.
But for someone who's looking to buy an ultrabook , it seems worth the wait.
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@Ratul , COre I7 3610QM is an entry level "Core I7" CPu . I didn't meant I7 as entry level instead it was meant for the Model No.