Self Balancing Between Excessively Low/High Fees and Block Size
A new BIP being discussed on the Bitcoin-dev mailing list is aiming at making variable Bitcoin block size depending on the fee the sender is willing to pay, the BIP is aiming at making the block space small, decrease the impact of spam transactions, balancing fees with smaller fees increasing in a higher percentage than higher fees, allow larger block size if the sender is willing to pay for it, allow wallets to display the amount, and price, of free block space left and allow senders to have more control on their fee/priority structure.
Potential Privacy Issue With Dual Funded Channels

Dual funding and splicing mechanisms allow initial negotiations between node to allow the node on the other end an opportunity to put funds at channel opening time or after it. Finding liquidity is a problem that had solutions suggested all the way back in November, the suggestion was, in summary, that a node will advertise initial liquidity matching via their node_announcement, this is meant to help these nodes source inbound capacity from a market of advertised liquidity rates as set by other nodes.

After a recent spec meeting, developer Rene Pickhardt noticed a potential privacy issue with this schema: a node can spam another probing for a lower bound for the amount of BTC available by this node, each time aborting the channel establishing before locking any of its own Bitcoin.

Introducing Liquid Core

Blockstream has just introduced Liquid Core, a multiplatform desktop wallet for transacting Liquid Bitcoin.

Users can deposit to supporting exchanges and withdraw as well as engage in peer-to-peer transactions. In addition, transactions are significantly faster (settled in two minutes) and users enjoy a default confidential transaction setting that hides sensitive transaction details such as transaction asset and amount from third parties.

Anyone familiar with wallets can use the Liquid Core wallet although Bitcoin Core users will find it much easier to navigate. Requirements and instructions on how to use the wallet are available on the website. See more details to get started.

ColdCard Wallet
ColdCard is another Bitcoin hardware wallet developed by a team in Canada, its used to sign transactions and can be used both online and offline, it runs PSBTs natively so it can run completely offline for its entire lifecycle.
The Great Consensus Cleanup
The great consensus cleanup is a new BIP suggested by developer Matt Corallo to address different issues in the current Bitcoin consensus, the new set of consensus changes aim at reducing complexity of Bitcoin implementations, improving worst-case validation times and fixing vulnerabilities like timewarp.