So much helpful , thanks all
Warning to surfers: although the title makes it seem as if the new MT5 has just arrived, the date of the original article in English is 17 December 2009.
As such, the content shows what was most advanced at the time, before MT5 actually arrived, and today, in fact, it is much more advanced than the one presented at that time.
A more recent reference in Portuguese (original from June 2012) is in the article https://www.mql5.com/pt/articles/384 (MetaTrader 5 - More than you think!).

MetaTrader 5 - Mais do que você imagina!
- 2013.12.10
- MetaQuotes Software Corp.
- www.mql5.com
O desenvolvimento do MetaTrader 5 iniciou em 2007. O Meta Trader 5 foi concebido como uma plataforma de multimercado que pode ser executada no Forex assim como em qualquer outro mercado financeiro. Muito trabalho foi feito desde então e o resultado desse trabalho é a plataforma que fornece oportunidades ilimitadas aos traders. Neste artigo...
Attached source code insets in HTML code are now completely translated into Portuguese for your convenience.

MQL5.community - User Memo
- 2010.02.25
- MetaQuotes Software Corp.
- www.mql5.com
You have just registered and most likely you have questions such as, "How do I insert a picture to my a message?" "How do I format my MQL5 source code?" "Where are my personal messages kept?" You may have many other questions. In this article, we have prepared some hands-on tips that will help you get accustomed in MQL5.community and take full advantage of its available features.
Awesome article! Thank you for putting time and effort in writing this.

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New article Here Comes the New MetaTrader 5 and MQL5 is published:
This is just a brief review of MetaTrader 5. I can't describe all the system's new features for such a short time period - the testing started on 2009.09.09. This is a symbolical date, and I am sure it will be a lucky number. A few days have passed since I got the beta version of the MetaTrader 5 terminal and MQL5. I haven't managed to try all its features, but I am already impressed.
Fig. 1. It's not Photoshop - it's MQL5.
Author: Yuriy Zaytsev