[Xrystal]

Okay, this is the barest minimum I needed to get it to work. The fading code used is simply due to its simplicity. I am personally using animation fading in my big project so I'll leave any changes you require up to you.

<YourAddonName>.TOC

## Interface: 80000
## Title: <YourAddOnName>
## Notes: Shows a Splash Window
## Version: 1.0.7
## Author: Whoever wants to use it honest
## eMail: contactme@myemailaddress
## DefaultState: Enabled
## RequiredDeps: 
## LoadOnDemand: 0
## SavedVariables: 
## SavedVariablesPerCharacter:  PawDB

<YourAddOnName>.lua

<YourAddOnName>.lua

local addonName, addonData = ...
 
-- Create a new table if it is empty
addonData = addonData or {}
 
-- Get this version of the addon
addonData.version = GetAddOnMetadata(addonName, "Version") 
 
-- Force initialisation in case there are no saved variables yet
-- These should get overriden when the saved variables are loaded
PawDB = {}
PawDB.version = nil
 
-- Create the frame and set up its visual details, I've just created a white background
-- By Default it will show so FadeOut immediately via the method you choose
local InstallerLogo = CreateFrame("Frame", addonName.."ILogo", UIParent);
InstallerLogo.Background = InstallerLogo:CreateTexture( "$parentBackground", "BACKGROUND" );
 
-- Create UI Elements
InstallerLogo.Background:SetAllPoints()
 
-- Customize the Elements
InstallerLogo.Background:SetColorTexture(1,1,1,1)
 
-- Fade Out the screen as we don't want to see it by default
UIFrameFadeOut(InstallerLogo,1,1,0)
 
-- Event function
local function OnEvent(self,event,...)
    
    -- if this is the first time entering the world
    if event == "PLAYER_ENTERING_WORLD" then
        local login,reload = ...
        
        -- Displays the two values in the chat frame so you can see what is being tested
        --print(addonData.version, PawDB.version)
 
        -- Only process this block if this is the first time logging in and the version numbers are different
        -- Addons will only know about a TOC change if the change was made before you logged into the game ( character screen is not enough, log right out to the beginning)
        if login == true and addonData.version ~= PawDB.version then
 
            -- Set up the Splash Screens UI with its required data and any other changes not already made
            InstallerLogo:SetSize(850, 480); -- the size of the splash
            InstallerLogo:SetPoint("CENTER"); -- its position on the screen            
 
            -- Then fade it into view using your preferred method
            UIFrameFadeIn(InstallerLogo,1,0,1);
 
            -- Then Update the saved variable table for the character with the new version 
            PawDB.version = addonData.version
       end
    end
 end
 
 
-- Create the frame that will monitor events and tell the other frames what to do
local EventWatcher = CreateFrame("Frame")
EventWatcher:RegisterEvent("PLAYER_ENTERING_WORLD");
EventWatcher:SetScript("OnEvent", OnEvent)