Hi MacRumors users, I've been successful in my application a Master of Philosophy in Mathematical Sciences, and my current laptop (a Windows machine) needs replacing. I want to get a Mac laptop since everyone in the School of Mathematical Sciences at the university uses Macs (as their desktop machine, at least), and, in particular, my supervisor is a genius technologically, so it will be easier for him to teach me about all the programming, coding, software etc. that I will need to use if I have a Mac. I'm currently tossing up between a 13" MacBook Air (Haswell) and a 13" Retina MacBook Pro (Haswell), which I'll obviously have to wait for, not having been released yet. With both machines I'll definitely have a 256GB+ SSD, 8GB RAM, and an i5 or i7 processor. I'll be using my new Mac for my project and assignment work, which will involve programming and coding in software such as LaTeX, R, etc. I'll also be using it for web processing, office software (Word, Excel, etc). I'll probably end up using Windows with a dual-boot or virtual machine set-up, since I'm new to Mac and want to make the transition as smooth as possible. When I spoke to one of my supervisors about how much processing power I'll need, he said that a MacBook Air will have enough processing power for everything I'll need it for, and that I can use the university's server should I need more processing grunt. However, since I'm considering dual-booting or virtual-machining, I'm still considering the yet-to-be-released 13" Haswell rMBP, as the extra grunt may come in useful. Also, it has an extra thunderbolt port and an HDMI port, which will be very useful as I'll be connecting an external (HDMI) monitor to the laptop. A few questions that will be helpful: How much faster is an i7 processor than an i5 processor for the type of work that I have mentioned? (In both "full" and ULV processors) How much better is the battery life for an i5 processor compared to an i7 processor? (In both "full" and ULV processors) How much faster is a "full" i5/7 processor on the rMBP compared to the ULV i5/7 processor on the MBA? Correct me if I'm wrong, but given that the stated battery life of the MBA jumped from 7 to 12 hours when it was update with Haswell, can we expect the same for the rMBP? Let me know which way you think I should go. God bless, Andy.