So what you're saying is that you want the final stats of what it will be... So they give you the stats, and then this happens again later when they up the endgame ilvl again... lather rinse repeat...

Let's look at Ranger R/E/M (which it says is your main job! Woooooo! I <3 ranger!).

I've been working on my relic and empy for a while now (I've sort of put mythic on the back because I like the bow, and I already have the weaponskill, and can't get into assault to solo them, etc... so w/e)

Relic Bow (99) Yoichinoyumi
DMG:126 Delay:524 Ranged Accuracy+40 Ranged Attack+30 "Namas Arrow"

Empy Bow (99) Gandiva
DMG:117 Delay:490 DEX+20 "Jishnu's Radiance" Aftermath: Occ. deals double damage Afterglow

Echidna's Bow (ilvl117)
DMG:248 Delay:600 Archery skill +215 "Store TP"+4

So, at first glance, to "fix" the bows, we need them to be on par with the new echidna's bow (or +1).

Let's double the damage. But wait, shouldn't we add some archery skill too? how much is a good amount? +215? +220? Ok Done.

What ilvl will it be? ilvl 120? Highest in the game (atm?) ok, done.

Now add some dex to the Gandiva, and some Racc and Ratt to Yoichi?

How do you get from ilvl 99 to ilvl 120?

How do you balance these weapons out without making them cookie cutters of the new delve stuff? I'm pretty sure that that's what they're trying to figure out. I'm not expecting them to get it done OMG right now. I'd give them a bit of breathing room. EVERYONE is breathing down their necks right now. Be it rieves (too much hp, too little hp, too fast, too slow, too easy, leechers, etc...), REMs (popular NM now... so much so that I hope they introduce an NM called Remmy. OMG! It could be part of the REM upgrade path! Ridiculous Remmy. It can be a floating eye that spams sleepga II while having its minions attack you. Or berserk, they could add that spell. You can only attack, can't cast magic, etc... (like in FFXII). New strategies for all!), Not enough Low-man content, Too many things are soloable, delve is unfair, we want free mythics, the list goes on and on...

If you don't want to play until the situation is done, then take a break... Keep your eye out on stuff on the forums. Your character will still be here when you get back. (I took a 2 year break and came back, and all my stuff was still there!) It's not like you're going to want a weapon besides the REM you have when it gets to 120, so that would be a moot point. As for the equipment, if you feel like you'll be left behind, then keep playing.

I think they've heard so much about this that they moved it up, but learned from all their past mistakes of releasing info too early (like with summons for example) that they want to make sure it's perfect before they release it. Questions they need to ask include:

What is the ultimate weapon going to look like? (I'm sure they won't stop at ilvl 120, they'll go so much further and they'd want to plan for that)

How will they level up their weapon? (TotM? Trading items/old weapons/panamas? XP in appropriate zones? Some completely new way that no one can think of because it's too awesome?)
- How many steps will it take to get ilvl120/150/200/9999

How are we going to let these guys unlock their weaponskills if they want to do so?

What stats will they have?

Will it be too overpowered?

Will we add any additional effects?

I like the saying "Measure twice, cut once," and "Good things come to those who wait." Maybe, instead of rushing into this, because they know that people take pride in these weapons, and they want to do a good job, they're taking so long to plan it out to give you the uber weapon you always wanted your REM to be. Pressuring them to do an update tomorrow (I'm 95% sure you're not trying to do that...) will result in a substandard/broken weapon that will get even more people to quit.

TL;DR:

They're working on making your weapon awesome.

(PS. Devs, new "Legendary weapons" would be awesome... I mean, come on... That would be... legend... wait for it, AMAZING!)