Initial 4.2 blog post

docs/en/Blog-Posts/2021-01-14 v4_2_Preview/POST.md

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+# ABP Framework 4.2 RC Has Been Published
+
+Today, we have released the [ABP Framework](https://abp.io/) and the [ABP Commercial](https://commercial.abp.io/) 4.2.0 RC (Release Candidate). This blog post introduces the new features and important changes in this new version.
+
+> **The planned release date for the [4.2.0 final](https://github.com/abpframework/abp/milestone/48) version is January 28, 2021**.
+
+## Get Started with the 4.2 RC
+
+If you want to try the version `4.2.0` today, follow the steps below;
+
+1) **Upgrade** the ABP CLI to the version `4.2.0-rc.1` using a command line terminal:
+
+````bash
+dotnet tool update Volo.Abp.Cli -g --version 4.2.0-rc.1
+````
+
+**or install** if you haven't installed before:
+
+````bash
+dotnet tool install Volo.Abp.Cli -g --version 4.2.0-rc.1
+````
+
+2) Create a **new application** with the `--preview` option:
+
+````bash
+abp new BookStore --preview
+````
+
+See the [ABP CLI documentation](https://docs.abp.io/en/abp/latest/CLI) for all the available options.
+
+> You can also use the *Direct Download* tab on the [Get Started](https://abp.io/get-started) page by selecting the **Preview checkbox**.
+
+## What's new with the ABP Framework 4.2
+
+TODO
+
+## What's new with the ABP Commercial 4.2
+
+TODO
+
+## ABP Commercial
+
+TODO
+
+## About the Next Release(s)
+
+TODO
+
+## Feedback
+
+Please check out the ABP Framework 4.2.0 RC and [provide feedback](https://github.com/abpframework/abp/issues/new) to help us to release a more stable version. **The planned release date for the [4.2.0 final](https://github.com/abpframework/abp/milestone/48) version is January 28, 2021**.