Support of new tables in Joomla 3.2 was added. Please re-save settings of your sites if they share Users or Content (required for Joomla 3.2 only).
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Joomla 3.1.4 as minimum is required (or 2.5.13 series). List of changes: ⋅ Added Joomla 2.5 compatibility. ⋅ Added 'Search Meta Keywords' feature: now search query is also optionally searched withing term meta keywords. ...

... is I would like to get the 15 websites up as soon as possible and hoping that your application can greatly help me in reducing the amount of work required for this. Would greatly appreciate a quick reply as I would like to go ahead and purchase it. Thank you so much for your time

Yes, that's possible.
Second domain should parked on top of main site, so both sites will use same files.
Second site will use own database, but Kunena (and Users - also required) will be loaded from main site, so forum and users data will be always same.

No, IonCube was dropped and is not required.

I am just looking to purchase another license, and this is on a different host. I need to prepare the server account to handle this and want to make sure I am taking the right steps ahead of time.

Thank you.

... mean as "supported"? All extensions work with MightySites as usual and there is no need for additional support. Additional support is required only if you want to share extension's data across sites. For this we need to investigate how FieldsAttach works first (please create a ticket ...

We are working on conversion as a service, hope to see it in 1-2 weeks.
For now conversion is available for Joomla 2.5 by request only, Kunena 2.0.2+ is required.

... Joomla's mod_login which shows the avatar from phpBB. The attachment contains custom layout files for mod_login for Joomla 2.5 and 3. Extract required archive into /templates/your_joomla_template/html/mod_login/ folder (create if not exists), next select 'p8pbb' layout in login module's settings.

... be set up the same way. so some.url.com and some-dev.url.com. the dev is not accessible outside the company network. for your bridge, would I be required to buy two license? thanks! James