Galaxy S4 has rushed through "shipped" figures reaching 6 million in 15 days, and early adopters have started reporting bugs like overheating cases, battery drain and most common one is the camera bug that freezes the phone and causing phone to reboot.
If you can manage to use Better Battery Stats app to understand what are the processes/wakelocks causing actual battery drain on your S4, it is a good app to use, else if you prefer simple data on battery draining apps try Wakelock Detector
Excessive over heating needs attention and fixed on time with replacement if required, do not play around till your phone gets damaged.
Coming down to Camera Bug, try this option on your S4 going into Settings - More - Developer Options (Enable this section clicking on it 7 times) - Scroll down to Apps section - Limit background processes - Select "at most 4 processes"
Screenshots below
This is a kind of temporary solution that worked for me worth trying until Samsung comes up with a proper fix in any next firmware update.
BTW, Google announced availability of Samsung Galaxy S4 with stock android going on sale in US in June'13, really doubtful if Samsung would allow Google to put this handset on sale in India else it would be a great alternative to get rid of Touchwiz bloatware which has eaten up a lot of internal storage memory.
***Jun'13 Update:JDQ39.I9500XXUBMEA Firmware***
After upgrading my S4 with the above mentioned Jelly Bean 4.2.2 Firmware version, my phone has crashed twice. Once when I switched it off on low battery and powered it again for charging it frooze on boot animation screen and I had to perform a hard reset, 2nd time it happened due to a flash light app that got stuck and after rebooting same issue.
One thing to note is that this firmware version does not increase the internal storage size from 8.83 GB to beyond 9 GB, it only updates internal available memory to 8.90 GB. Camera bug issue seems to be fixed now and OS seems more responsive and fluid.
I noticed good standby battery back up with regular use on my phone though after the firmware upgrade, screen below.
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