Is it really worth custom-flash to 4.4.2 Portugal if you're not from that country or would you just prefer to wait for the official to roll out?
In my opinion, since there's not much to brag on the KitKat version of Galaxy Mega, I would stick to JellyBean and wait for the official OTA from Samsung. I don't see any custom ROMs for the GT-I9205 yet and there are not many developers into this device compared to the good old S2, S3, S4, S5 series. I'm not sure why, there are more custom ROMs for low-branded devices such as the Lenovo series. Now, I feel a bit regretted buying this phone unless you're a big fan of TouchWiz UI (on a big display panel) and don't like the Xperia, or HTC Sense interface, this is for you.