I like it that the Visual mode in New Discussion handles templates, wikitables, pre, etc. that were created in Source mode (which can't be used in Reply Tool until there’s markup for multi-line list items ... well, templates could, if there was some way to flag in TemplateData which ones are single-line safe).
I noticed that some VE magic text like ‘[[‘ and ‘<pre>‘ activates the corresponding edit cards, but ‘{{‘ doesn’t. Instead I get the message ‘wikitext markup detected ... switch to source mode’.