This is the new slogan in the Charedi world to mean listen to דעת תורה.
Lately it is being used to mean that everyone needs to listen to R' Elyashiv whatever he says. Here is a good example:
The implication of the poster is that everyone needs to now stop wearing sheitels because R' Elyashiv said so.
The problem is that for the past 2000 years halacha hasn't worked that way. Once there is no בית דין הגדול there is no final psak. Throughout the generations we find disputes in halacha and we don't always pasken like the "posek hador". R' Moshe Feinstein was certainly the posek in America after WWII and yet many of his psakim were not accepted. The same goes for the Chazon Ish and every other great posek. Therefore, for these people to say that we always pasken like R' Elyashiv is a perversion of the halachic process and was never the case. The fact is that R' Elyashiv has shitas on many issues that no one paskens like, they just aren't publicized.
A good example of this is the shita of the Chazon Ish by מעמיד of a succa. The Chazon Ish holds that you cannot use metal anywhere in your succa even screws becuase it is considered מעמיד בדבר המקבל טומאה. There is no question that in his day the Chazon Ish was the "posek" in Israel. Yet, very few people followed this shita of the Chazon Ish. The answer is simple. As great as the Chazon Ish was we don't pasken like him on every issue. The same applies to R' Elyashiv and therefore every person needs to consult their Rabbanim about every issue.
Unfortunately there is a trend in the Charedi world taht says everyone has to be exactly the same. There is no room for different psakim, different minhagim, etc. Everyone has to follow a specific shita and that is it.