It's not "no explanation offered". Adobe Flash is being abandoned by, well everyone, because of HTML5. Basically, no new devices will support it and gradually (or quickly) Flash will be phased out. Soon it won't be supported on your PC browser either. There will be similar functionality (games, video etc) in HTML5 though, so don't worry too much about it. YouTube has already (almost) abandoned it.
I bought this tablet yesterday, and by late evening, I had Flash. I found out that, no matter what browser I downloaded, I couldn't download Flash. So, I went to Google Play and found a tutorial called "How to Download Flash ?" The person has a video that takes you through the steps on how to get to Adobe's archived Flash programs. Follow those steps, click on the exact one on which he clicks, and you should have Flash.
Adobe have stopped providing Flash to Android 4.0 or above. This effectively trashes video viewing ability of modern android devices. No explanation offered but if you check out the app on Google Play you will see it's official. Only fix is to download an older version of Android or go onto XDA developers site and get oldd version of Dolphin Browser. The current dolphin browser is problematic with Flash.
Yes, see here: http://forum.xda-developers.com/showthread.php?t=1774336 . Works with Firefox Beta and Flash 18.104.22.168, haven't tried Opera. Chrome doesn't support Flash. Install the Auto Full Screen Firefox add-on and you can watch videos in full screen without the nav bar.
search Flash Archive for Android on web, via your pad, and download and install the latest version. Then you will get it. (don't forget to change your setting to allow installing the web download sources.)
Actually, you can download flash player for ICS from adobe.com. Check "archived player". Make sure "unknown sources" in security setting is checked. Currently Dolphin and FireFox can use flash player. However, you will soon realize you will need it less and less over time and replaced by HTML5.