Since their announcement last month, we haven't heard too much about the Galaxy Mega 5.8 and 6.3 (barring rumors of a delayed release). That doesn't mean Samsung plans on breaking its pattern of timely (or early, depending on your perspective) kernel source code releases. Keeping with form, Samsung has released kernel source for the 6.3" Mega's I9205 (LTE) variant.
There's no sign of the Mega's I9200 version (or the Mega 5.8) just yet, but given Samsung's track record, we can expect it any time now. In the meantime, those of you wishing to scoop up a handful of brand new kernel source need only hit the link below.
Source: Samsung Open Source