3.5e was backwards compatible with 3e in the sense that WotC is using the term with 5.5e. There wasn't much you had to do to convert things.New edition in the book-publishing sense (different typesetting, pagination, art, etc.)? Yes, obviously.
New edition in the idiosyncratic way that RPG players mean, where a new edition is a new version of a game's base ruleset? No, not in the way that WotC has used the term "edition" historically. (The argument could be made that the leap is similar to that between AD&D 1st Ed. and 2nd Ed., but I'm not sure if TSR's usage is relevant here.)
WotC has never changed edition numbers without also creating a whole new incompatible game system, with entirely different XP advancement tables, saving throw mechanics, attack roll calculations, spellcasting mechanics, etc. This new 5.5 edition is . . . clearly not that relative to 5.0. In fact, the change from 3.0 to 3.5 is a pretty apt analogy.
More importantly; why dont Madden fans care???Another fun question - Is Madden 2024 (or whoever year they are on) a new edition of Madden?
So, same as it always was?I think people are tired of the discussion, but only just waking up to the real implications. There will be 2014 tables, 2024 tables, and a whole variety of permutations in between.
Not on this scale.So, same as it always was?

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.