The Reminders and Events panels both use EventKit which only added reminders support in iOS 6. Also the high adoption rate of iOS 6 makes it not worth while to support older versions.
I've spent many hours on other applications, mostly Mac, where the time spent making something backwards compatible was never really worth it. Example: I worked on getting fancy animations in an app that had to support Panther, which didn't even have NSAnimation support. However at this time Leopard had just came out and had all the new Core Animation hotness. Needless to say I would have saved countless hours if I didn't try back porting new features to older OSes no longer supported by Apple.
Thanks for the answer - I fully appreciate what you say. I'm just a bitter iPad1 owner whose £400 toy became obsolete barely a year after purchase. It's a shame there isn't a native equivalent of progressive enhancement.
To be fair the iPad shipped with iOS 3.2 and has seen upgrades through 4.x and 5.x. My iPad 1 from 2010 saw a good few years of use, rather than just barely a year.
Walking estimates too? Actually... I mean, I know how long it takes me to walk to work, but it'd be good to just be able to punch a number in. (Maybe automatically multiply by 1.1 or 1.2 when it's raining).
Interesting idea. Are you thinking something along the lines of Mail.app's VIP feature where certain e-mails are propagated to the top or are you just talking about the content of mailing lists you subscribe to?
I've thought about a Mac app version of it, just haven't had the time to mock it up and prototype it. I can you keep you posted on that front, but the next thing on the list is iPhone support.
We plan to make it a universal app sometime in the near future. We just wanted to focus on making it great on the iPad first, where we thought the concept worked best.
The to-do part is pulling them in from iOS' built in Reminders app. That means you don't have to have yet another to-do app and it syncs via iCloud to your Mac and other devices.
The same goes for the events/calendar panel. They are both using Apple's EventKit API.
The news panel supports RSS feeds and Twitter is a possible option in the future, I'll look into doing it.