Interesting developments are underway in Ethereum's roadmap. Large-scale upgrades to the state tree and virtual machine are being considered, which could have a significant impact on the entire protocol.

First, the key point is the change in the tree structure. A shift from the current hexadecimal Keccak Merkle Patricia Tree (MPT) to a binary tree structure is planned. This change is expected to shorten Merkle branches by four times, greatly improving efficiency. Not only will client-side verification processes be enhanced, but data bandwidth costs for applications like Helios and PIR are also expected to decrease. Furthermore, with the new binary tree design, access to adjacent storage slots will become much cheaper, potentially saving over 10k gas per transaction in many DApps.

Additionally, reforms around the virtual machine are also significant. They are considering transitioning from the current EVM to a more efficient RISC-V-based new VM. The goals are to simplify the protocol, improve execution efficiency, and enhance the proof experience for zero-knowledge applications. The roadmap involves deploying the new VM for precompilation, allowing users to deploy contracts compatible with the NewVM, and ultimately phasing out the EVM in favor of replacing it with smart contracts based on the NewVM, following a phased approach.

These upgrades could address major bottlenecks in proof efficiency. They will also expand the use cases for client-side proofs. Ethereum's scalability and efficiency are poised to move to the next level.