Go download the update, everyone.

Funny...
I just checked it, and found nothing available.

It can take up to 24 hours before the update appears on all of Apple's servers, so please try again later if you don't see it yet.

I was able to get it around 1pm Central time. I have found that sometimes if I his "updated" a few times, it will find something again. I was stuck in line so I did that and I was rewarded with Mantis 4.2!

Okay...
It finally showed up.

Is there a manual to introduce the new and improved features in 4.2?

There is no manual available yet, but we'll be releasing some more tutorial videos soon that will help a lot.

Most of the items that are new are pretty simple to figure out. Tap a verse number, then tap "Email Verse" to email the current verse. Pretty simple stuff.