Initial 4.1 release blog post

docs/en/Blog-Posts/2020-12-18 v4_1_Preview/POST.md

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+# ABP Framework 4.1 RC Has Been Published
+
+Today, we have released the [ABP Framework](https://abp.io/) (and the [ABP Commercial](https://commercial.abp.io/)) 4.1.0 RC. This blog post introduces the new features, important changes in the new version.
+
+> **The planned release date for the [4.1.0 final](https://github.com/abpframework/abp/milestone/47) version is January 4, 2021**.
+
+## Get Started with the 4.1 RC
+
+If you want to try the version `4.1.0` today, follow the steps below;
+
+1) **Upgrade** the ABP CLI to the version `4.1.0-rc.1` using a command line terminal:
+
+````bash
+dotnet tool update Volo.Abp.Cli -g --version 4.1.0-rc.1
+````
+
+**or install** if you haven't installed before:
+
+````bash
+dotnet tool install Volo.Abp.Cli -g --version 4.1.0-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/3.3/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 4.1
+
+TODO
+
+## What's new with the ABP Commercial 4.0
+
+TODO
+
+## About the Next Release(s)
+
+Beginning from the next version (4.2.0), we are starting to spend more effort on the CMS Kit module. The purpose of this module is to provide CMS primitives (e.g. comments, tags, reactions, contents...) and features (e.g. blog, pages, surveys) as pre-built and reusable components. Current blog module will be a part of the CMS Kit module. We will continue to prepare documents, guides, tutorials and examples. And surely, we will continue to make enhancements and optimizations on the current features.
+
+The planned preview release date for the version 4.2.0 is January 14, 2021 and the final (stable) version release date is January 28, 2021.
+
+Follow the [GitHub milestones](https://github.com/abpframework/abp/milestones) for all the planned ABP Framework version release dates.
+
+## Feedback
+
+Please check out the ABP Framework 4.1.0 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 [4.1.0 final](https://github.com/abpframework/abp/milestone/45) version is January 4, 2021.**.