I'll try to summarize the Mtgox news as good as I can.
If I get anything wrong: please correct me. I have never followed it that closely, except when the coins move, just because I didn't have any money on the exchange at that time. I did use them once before they goxxed.

So yesterday's "news" was basically just a draft of the rehabilitation plan. This plan still needs to get finalized and voted on by the creditors.
CoinLab didn't settle, the litigation is still very much ongoing.

Fortress negotiated with CoinLab and the trustee an early-out for people who want to have their money back immediately. This early lump-sum payment is opt-in and is in cash. This is lump-sum is basically pennies on the dollar.
https://www.cryptoninjas.net/2021/01/15/billions-of-dollars-in-bitcoin-becomes-available-to-creditors-of-mt-gox-bitcoin-exchange/

Someone did the math on all of this and it's ~$1715 per #Bitcoin . So only people really desperate will pick this option.
Fortress has been buying MtGox claims for a long time and this might actually incentivize people to sell their claim to them. https://www.reddit.com/r/mtgoxinsolvency/comments/ky7exa/why_21_is_actually_only_468/

Now for the people that aren't happy with that and don't opt-in on the early lump-sum payment and want more money back there are 2 more options. They can wait until everything is settled and get a final payment which by default is in cash. Or they can opt-in to get coins back.

Fortress has been buying claims for a long time since it makes them stronger, if they have the majority of the creditors votes, it makes it easier for them to negotiate with with trustee and CoinLab.

So tldr; litigation very much ongoing, there's a quick out for people that need quick cash but unless you really need money asap, it makes no sense to go for it.
There are no dates set, this is just a draft and needs to get voted on.
This will probably drag on for years to come.

And oh yeah this also means that: no, for now there are no 150k coins getting dumped on the market.