Hiya!
First, Feats are not "canon", per se, they are OPTIONAL (just like Multiclassing). But, yes, they are 'in' the core books...just not used as a base for the game.
Second, and IMHO, "unfortunately yes" for introducing yet more feats. I'm sure they will come very slowly, and not all at once, but they will come. And each time a new feat or two comes up, it will 'break' some part of the core rules somehow (combos with other 'optinal' stuff not intended and whatnot). *shrug* I don't use feats, so it's just annoying to read/hear about them...but at least I don't have to deal with them at my table.
Third, Weapons? Yeah, sure. But they won't be much more than what we have in the books...you aren't likely to find new 'rules' for dealing with Bolas or Garrot; they will use what is in the core books, I'd guess. Bola probably would be a slightly reworked Net, and a Garrot would probably be the same, but maybe use the Grappling rules in stead of normal "to hit" or something like that.
Also...what's stopping your PC from saying "I build myself a Bola" or "I guy a Bola", or "I get a weaponsmith/leatherworker to build me a bola", etc? You, as a player, don't have to worry about the specifics...that's your DM's job. If your DM just says "No, they don't exist", then it doesn't matter if it comes out in a book or not...your DM isn't going to use them, so that's that.
My suggestion is to create a character in 2e, then 'convert' him into 5e. For things that are core to the characters identity, talk to your DM. One of the best things about 5e is the focus on "creative DM input". That is, it is
very forgiving in the "just make
up" department for DM's. You want to use/make a Bola? As DM, I'd just say "Ok, use the stats for Net, but with it affecting Small or Medium only and a range of 15/40, DC 12 Str to free, but only needing 3 points of slashing damage to cut it off". Garrot? "Only usable via surprise. Hit causes 1d3 + Str damage per round. Attacker must maintain a Grapple each round to do so, and requires two hands to do so". That's off the top of my head, as I've never really seen bola used in any version of D&D I've played in, and as far as I can remember,
never seen a garrot in use.
For me and my group, 5e is much more about "Take X, refluff as Y, add/subtract Z if needed"...very much a BECMI or 1e AD&D feel, IMHO. If you want minutia of mechanical stuff...give Pathfinder a shot. If you want imaginative, fast-n-loose, DM-is-
needed type of a game...5e will fit the bill nicely.
^_^
Paul L. Ming