But Bree didn't die on October 12th, which is why I think we weren't ever given additional hints from Cassie as to how to solve it. It would've looked silly at that point.
So with this I modify my earlier theory that the CiW PMs abandoned their ARG. I mean, they kind of did by not helping us have that closure...
But I think that they may have thought "no closure" was better than the lame closure we would've gotten if we'd solved that anagram. It wouldn't have made sense since Bree was alive and well.
Thinking about it, Cassie the spirit saying this anagram, combined with that note from Frank's wife, really does seem like it was the intended end of game.
In a way this further makes me think CiW is NEVER coming back. Not unless the solved anagram says something to that effect.
The only way we'll ever know for sure is to finish it though. Until then, CiW rests... but not in peace.

From the LGPedia:
1 You were the ones with every clue
2 The final step was right above you.
3 Yet upon dead skies hovered anew
4 (A) m hsddo yAeh n sodadu lewy aobec lnwdi ( 8 )
5 (I) ud ieosih tuyrla svtuI tlvty glgje he (7)
6 Kane is full, yet glad I avoid you.
7 You've left me to my lonely doom
8 The doe-eyed whore into the room
9 Trace her to it, set in sin’s tomb
10 (I, B) ltnsIolB ruseur uyufft'o o e e (6) (possible : I'll not suffer Bree too... )
11 Look up above and down below,
12 This is not a game you'll know
13 The waters thin, so don't be late
14 (Y) o i 'tbeko Yneohpo tuo ug ehdvtzny rwou ( 8 )...zero weight
15 (Y) oruu t e tw'o mloeiflYt ernt osabi (7)
16 (I) ,cler oIre rmit ttii ur lknte ltwhu (7)
17 (I) hdoltau ey e tm i awwaIoh imr g ( 8 )
18 (I) e y to h ad eiau oIhraet glrnteml ( 8 )
19 Is a girl whom he won't release
20 And Cassie does not rest in peace
21 Cassie does not rest in peace.
Possible Line 6: I foully avoid, die guilty as Kane
Possible Line 18: In the great realm you had to lie
This is the original anagram :
Y eyeeu estew h ceoovrneht l irwu
fyaugtbov tn ihalwp e T osaer iseh
nskvseYe adep euiaw d nhetdroe o
m hsddo yAeh n sodadu lewy aobec lnwdi
ud ieosih tuyrla svtuI tlvty glgje he
I oef gyaun laild ltd ay, esvKui o
fu 'oye o el oomlte enmomlYy dvt
wo ddooeeyTh oteth re- ehm r oine
ehr' st ceTsit o tri aoenbei t,mu s
ltnsIolB ruseur uyufft'o o e e
,lewab ooLk ownov oe dnad bpu
k oahw emtu y Tslng i onaliso'
eT we'ttae dsrho thos,ieat nl b n
o i 'tbeko Yneohpo tuo ug ehdvtzny rwou
oruu t e tw'o mloeiflYt ernt osabi
,cler oIre rmit ttii ur lknte ltwhu
hdoltau ey e tm i awwaIoh imr g
e y to h ad eiau oIhraet glrnteml
w oho lgiw'sne tsre ahaeer Im l
eeao siaC epnesrAto dns d nestc i
esnnCsietpsre eea o dios at c