Here's a Draft of milestones that can be included in the future Roadmap. These are ordered in a complexity / priority order.  Subject to change as we are still working on it:

0. Fix any outstanding bugs, stabilize code.
1. Create Masternode button
2. .deb package for Ubuntu Linux
3. Auto-selection of transactions based on advanced selection criteria
4. Hot MasterNodes on Windows
5. Proposal Tab
6. Fix multi-signature functionality
7. Support for Ubuntu 18.04 LTS
8. Further exchange listings
9. CoinMarketCap listing (need at least one more supported exchange)
10. Fix/enable Zerocoin feature
11. Fix budget proposal payments
12. Change consensus to use secp256k1 instead of OpenSSL
13. Ledger Wallet support
14. Payment Gateway
15. IoT device wallets (such as Android TV & Raspberry Pi 3) with support for staking
16. Web Wallet
17. Mobile Wallets
18. Decentralized peer to peer wallet trading
19. Paper wallet