SharePoint Server 2019 on-premises will be released mid of 2018

The new Office 2019 will be released mid - 2018.

This release contains

Office Apps  (including Word, Excel, PowerPoint, and Outlook)

Servers (including Exchange, SharePoint, and Skype for Business)

Key SharePoint 2019 features 

• More modern page layouts and site template
• Enhanced support for hybrid environments
• Enhanced support for SPFx, which will become the most important development environment to add functionality to SharePoint
• The modern look will become the default look while the classic look will pushed back
• Out of the box look and feel will get an overhaul, SharePoint 2019 will look modern
• Forms (used in list and libraries) can be edited with PowerApps
• Microsoft Flow will become the default workflow engine, although old workflows will remain usable

• Modern UI
• InfoPath is still supported
•  Improved Sharing capabilities
• Shorter urls
• Share from office
• No Microsoft account needed for sharing securely
• File view analytics
• File previews
• Sync IRM-enabled libraries
• New web parts
• Better Teams and Groups integration
• Mobile App
• Search

if you need further details please refer the Collab365 Community and CMSWire

Sharepoint Framework Configuration with Proxy server - Autentication Error - Resolution

Step 1 : Installation of Node JS.
Step 2: Installation of Yeoman and gulp. if the development environment is behind the proxy server. installation wont happens.

You have to configure proxy server with the following command.

npm config set proxy http://proxy.company.com:8080
npm config set https-proxy http://proxy.company.com:8080

normally it works.

if you got the following error. Authentication is required for Proxy.

Error
npm ERR! registry error parsing json
npm ERR! registry error parsing json
npm ERR! Unexpected token A
npm ERR! Authentication Required
npm ERR! npm ERR! npm ERR! If you need help, you may report this error at:
npm ERR!

Resolution
you have to set proxy with authentication

npm config set proxy http://username:password@proxy.example.com:8080
npm config set https-proxy http://username:password@proxy.example.com:8080

gulp error : Error: Cannot find module '@microsoft/sp-build-web'

Error :  during new sharepoint Framework project creation you may encounter following error while creating local certificate.

C:\spfx\helloworld-webpart>gulp trust-dev-cert
module.js:471
    throw err;
    ^

Error:
Cannot find module '@microsoft/sp-build-web'
    at Function.Module._resolveFilename (module.js:469:15)
    at Function.Module._load (module.js:417:25)
    at Module.require (module.js:497:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (C:\spfx\helloworld-webpart\gulpfile.js:4:15)
    at Module._compile (module.js:570:32)
    at Object.Module._extensions..js (module.js:579:10)
    at Module.load (module.js:487:32)
    at tryModuleLoad (module.js:446:12)
    at Function.Module._load (module.js:438:3)


Fix
: the installation don't have dependencies  try to run following command.
C:\spfx\helloworld-webpart>npm install --save-dev


Execute the command Now you will get the solution


C:\spfx\helloworld-webpart>gulp trust-dev-cert
Build target: DEBUG
[14:32:33] Using gulpfile C:\spfx\helloworld-webpart\gulpfile.js
[14:32:33] Starting gulp
[14:32:33] Starting 'trust-dev-cert'...
[14:32:33] Starting subtask 'configure-sp-build-rig'...
[14:32:33] Finished subtask 'configure-sp-build-rig' after 13 ms
[14:32:33] Starting subtask 'trust-cert'...
[14:32:39] [trust-cert] Attempting to trust a dev certificate. This self-signed certificate only points to localhost and will be stored in your local user profile to be used by other instances of gulp-core-build-serve. If you do not consent to trust this certificate, click "NO" in the dialog.
[14:32:44] Finished subtask 'trust-cert' after 11 s
[14:32:44] Finished 'trust-dev-cert' after 11 s
[14:32:45] ==================[ Finished ]==================
[14:32:45] Project helloworld-webpart version: 0.0.1
[14:32:45] Build tools version: 3.0.5
[14:32:45] Node version: v6.11.4
[14:32:45] Total duration: 20 s