The extension of the East Rail Line to Admiralty opened 3 years ago (in May 2022).

Those with a long memory will recall that this was part of the "Sha Tin to Central link" that I have written about a few times, starting back in March 2008 (Sensible changes) and, yes, I might have become slightly obsessed with the way that it was misreported (Sha Tin to Central - or maybe not and Sha Tin to Central Link misinformation).

Fortunately, we have (eventually) ended up with a good solution. 

The southern terminus of East Rail is now Admiralty, which has 8 platforms (lucky) for 4 lines (ayeeah), meaning that you can continue your journey by going east, west or south.  Most interchanges are fairly easy (if you can deal with the large crowds), and it certainly does make it more convenient to get from the New Territories East to Hong Kong Island.   The only downside is shorter trains (First Class has survived, rather to my surprise), and yes I have written about that.

There's also the new Exhibition station, which maybe not quite as convenient for the Hong Kong Convention and Exhibition Centre (HKCEC) as you might have hoped, but obviously it's much easier than walking from Wan Chai station.  I had forgotten that it was originally planned to be an interchange with the North Island Line, which is why the platforms are on different levels, but that ain't happening any time soon.

There are also new platforms at Hung Hom, which were heavily delayed due to problems with construction.  This is an interchange with the other part of the SCL Project: the Tuen Ma line, which opened in June 2021 (see here).  For nearly a year there was a really inconvenient interchange between the old East Rail platforms and new Tuen Ma Line platforms, but now they are in the same place (albeit at different levels).

The Tuen Ma Line was previously known as the East-West line because it goes from the New Territories East (Ma On Shan / Sha Tin) to the New Territories West (Tsuen Wan, Yeun Long, Tuen Mun) via Tsim Tsa Tsui.  It's by no means a straight line and can be a bit confusing when the southbound service is heading for somewhere that is very much North West of where you are.

Seems to me that it would be helpful to announce the intermediate station (e.g. Tuen Muen via TST) where that is appropriate, as they do on the Circle Line in London.

By Hong Kong standards it's not very frequent (every 5-6 minutes off-peak) though they enhance that when there are events at the new Kai Tak stadium.  It also has two interchanges with the (KCR) East Rail, one at Tai Wai (easy for southbound connections because this section of the Tuen Ma Line has the two lines the "wrong" way round) and the new Hung Hom station.

There are more rail projects planned and under construction, the most significant being the Northern Link, which will go from the Kam Sheung Road station (on the Tuen Ma line) and a new Kwu Tung station (on the Lok Ma Chau section of East Rail).  There is also a plan for a new line from HKU through Cyberport and Aberdeen to Wong Chuk Hang, that may be started in 2027.